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DivestOS

DivestOS was a free and open-source mobile operating system based on a soft fork of LineageOS, prioritizing privacy and security enhancements for a wide range of devices, including end-of-life hardware no longer supported by manufacturers. Developed primarily by a single maintainer over approximately a decade starting around 2014, with its public release announced in June 2020, DivestOS diverged from LineageOS by de-Googling the system, removing over 700 proprietary blobs, and integrating unmodified F-Droid for free and open-source software distribution. Key features included monthly security updates for all supported devices, automated patching for more than 5,800 Linux kernel vulnerabilities, restoration of bootloader relocking on 23 devices, and verified boot on 36 devices. It also incorporated hardened components such as Mulch (a security-oriented Chromium WebView), Mull (a privacy-focused browser based on Firefox), Hypatia (an offline malware scanner with over 7.2 million samples), Carrion (a robocall blocker), and Extirpater (a secure free space eraser), alongside a custom hosts file blocking over 900,000 tracking servers. DivestOS emphasized long-term support, enabling offline operation without registration or tracking, and was particularly noted for providing "harm reduction" on obsolete devices through its privacy and security measures. The project, which amassed over 7,000 Git commits, was maintained without dedicated funding and relied on voluntary contributions. In December 2024, following its "Anniversary and Final Update," DivestOS and its associated apps were discontinued, with no further updates planned for the OS, apps like and Carrion (including database maintenance), or related services such as forums and XMPP chat rooms; non-mobile projects by the maintainer, such as and D-WRT modifications, continued separately.

History

Founding and Early Years

DivestOS originated as a private initiated in December 2014 by Tavi, a pseudonymous developer committed to open-source principles and advocacy. Tavi, who maintained the project single-handedly as a full-time passion endeavor rather than a commercial venture, drew inspiration from of software while addressing practical limitations in mobile ecosystems. The project's early motivations stemmed from growing concerns over Android's inherent vulnerabilities, the pervasive use of blobs in , and manufacturers' brief support cycles that left obsolete and unsecured shortly after purchase. Tavi aimed to create a de-Googled, hardened alternative that extended usability while minimizing and enhancing user control, prioritizing over absolute purity in a dominated by non-free components. Initially, DivestOS served as Tavi's personal fork of , concentrating on applying security patches, implementing privacy-oriented tweaks, and testing modifications for a limited selection of devices without any intent for public distribution. This focused, experimental phase allowed Tavi to iteratively refine hardening measures, such as those borrowed from projects like , while acknowledging the challenges posed by proprietary elements that could not be fully eliminated.

Public Release and Development

DivestOS was officially released to the public on June 12, 2020, with its announcement made by lead developer Tavi on the forums, marking the transition from private development that began in 2014 to open availability for a wide range of devices. The initial release focused on providing for end-of-life devices through a LineageOS-based system enhanced for and , with builds available for download via the project's website and integration. Key milestones in the project's evolution included the integration of custom applications such as , an open-source , which became a default component around 2021 to bolster on-device threat detection without relying on external services. In 2023, DivestOS achieved a significant advancement with the implementation of unprivileged support, allowing the open-source alternative to run without elevated system privileges, thereby improving compatibility for apps requiring location or push notifications while maintaining security isolation; this feature was introduced in the July 2023 update for versions 17.1 and higher. By 2024, the project had updated its base to (corresponding to 20), with ongoing security patches ensuring continued relevance for supported hardware despite the base version lagging behind the latest releases. Development of DivestOS was primarily handled by Tavi as a solo effort, supplemented by community contributions through merge requests on the project's repositories, where over 7,000 commits were accumulated across the codebase by late 2024. The process emphasized regular monthly patch releases, often incorporating upstream fixes from and Security Bulletins ahead of official vendor timelines, which extended the usable lifespan of older devices by several years. Builds were generated using automated scripts hosted on , ensuring reproducibility and transparency for contributors. In terms of growth, DivestOS expanded from supporting a handful of devices at launch to over 78 models by 2023, encompassing both mainstream smartphones from manufacturers like , , and , as well as legacy hardware that had lost official support, thereby broadening access to privacy-focused for a diverse user base. This expansion was driven by porting efforts from maintainers and targeted additions for end-of-life models, reflecting the project's commitment to device longevity until active development ceased in late 2024.

Discontinuation

The final release of DivestOS occurred on December 18, , followed shortly by the official announcement of discontinuation on December 23, , bringing an end to the project after a of development since its in 2014. Tavi, the project's sole maintainer, provided no explicit reason for the shutdown, though the inherent difficulties of single-developer oversight for a broad, resource-intensive endeavor—spanning over 7,000 commits—offer contextual insight into the decision. This development leaves users without future security patches, feature enhancements, or support for the itself, as well as key applications such as (a tracker database) and Carrion (a app); comparable privacy-focused alternatives, including , are recommended to maintain device security and privacy. In contrast, non-mobile initiatives under the Divested banner remain active, with ongoing maintenance for projects like , D-WRT modifications, real-ucode, and DNS blocklists. Following the project's end, community efforts have emerged to maintain certain apps, such as , with new maintainers handling updates including the malware database as of 2025.

Features

Privacy Enhancements

DivestOS implements comprehensive de-Googling by completely removing (GMS) and associated components from the operating system, preventing built-in Google telemetry, location tracking, and data syncing that are standard in stock distributions. This process involves stripping over 700 blobs during the build, significantly reducing the system's reliance on closed-source code and minimizing potential leaks from Google ecosystem integrations. As a result, users experience a Google-free environment that avoids automatic data transmission to Google servers without requiring additional user intervention. For applications requiring Google APIs, DivestOS provides optional support for unprivileged microG, an open-source reimplementation of GMS that operates as a standard user app rather than a privileged system component. This configuration denies microG elevated access to device hardware or sensitive data, such as location services, thereby limiting its scope to essential compatibility functions while preserving user privacy. Installation of microG is user-initiated via F-Droid, ensuring it remains disabled by default to avoid unnecessary exposure. Network privacy is bolstered through integrated controls, including a custom hosts file that blocks connections to over 900,000 known tracking and advertising domains, effectively nullifying common web-based surveillance at the DNS level. These features collectively restrict telemetry from system and third-party apps, such as limiting access to contacts, location, and background data syncing. The app ecosystem emphasizes open-source alternatives via the pre-installed, unmodified client, which serves as the primary repository for privacy-respecting applications without any proprietary store integration or tracking mechanisms. For users needing Google-dependent apps, an optional sandboxed Store can be installed in an isolated , leveraging enhanced app to contain potential and prevent system-wide propagation of tracking. System-level modifications further excise embedded trackers from core components, ensuring a baseline free of vendor .

Security Measures

DivestOS implements several hardening techniques to enhance memory safety and prevent common exploitation vectors. It incorporates a hardened malloc allocator, adapted from GrapheneOS, which provides protections against heap-based attacks such as use-after-free and buffer overflows by adding guard pages, zeroing freed memory, and enforcing stricter allocation policies. SELinux operates in enforcing mode by default across all builds, applying mandatory access controls to restrict process interactions and limit potential privilege escalations, with policies that cannot be toggled to permissive. Additionally, compiler optimizations include flags like -fstack-protector-strong to insert stack canaries for buffer overflow protection, alongside other build-time hardenings such as control-flow integrity checks where supported. Patch management in DivestOS emphasizes timely vulnerability remediation, particularly for end-of-life devices. An automated CVE patcher tool scans and applies patches for known vulnerabilities, addressing 50 to 600 CVEs per device depending on the kernel version, sourced from upstream repositories like . This process integrates with monthly security updates that extend beyond official Android Security Bulletin (ASB) support, incorporating patches, driver updates, and custom fixes to maintain system integrity. Boot security features focus on ensuring system integrity from startup. DivestOS supports Verified Boot on compatible devices, using cryptographic verification to detect tampering in the boot chain, with scripts and documentation enabling re-locking post-installation to prevent unauthorized modifications. The Auditor app facilitates remote hardware attestation, allowing users to verify boot state and key hashes against official DivestOS images via a dedicated . Exploit mitigations include enhancements to (ASLR), which randomizes memory mappings at a finer granularity than stock to hinder attacks, combined with restrictions on root access. The su binary is unavailable in production builds, and root mechanisms like Magisk or Xposed are explicitly unsupported, enforcing a no-root policy to reduce from .

Included Applications

DivestOS bundles a minimal set of free and open-source applications focused on and , eschewing any to maintain its de-Googled nature. The unmodified app store is included by default as the primary source for additional software, with DivestOS-specific applications distributed through its official repository. These apps received updates aligned with the operating system's release cycle, emphasizing without reliance on external ecosystems. Hypatia serves as an on-device, real-time scanner, the first (FOSS) implementation for . It leverages ClamAV-style signature databases aggregated from over 70 sources, detecting more than 7.2 million signatures by default (configurable up to 48 million), with scans completing in 5-40 milliseconds and minimal battery impact through local processing—internet access is limited to signature updates. Pre-installed on DivestOS, enables users to scan files, apps, and storage for threats without dependency. Carrion functions as a blocker, automatically rejecting incoming calls that fail verification to combat . This requires or later, VoLTE support, and carrier attestation, primarily benefiting users in regions like the where such protocols are implemented. Included by default, it provides a lightweight, system-integrated solution for call screening without or user-configured whitelists. Extirpater is a high-performance tool for securely erasing free space on storage, overwriting deleted data remnants to prevent recovery. Designed for use before device sales, after enabling encryption, or following bulk deletions, it operates efficiently on Android's flash storage but cannot fully overwrite certain areas due to hardware limitations. Available via the official repository, it supports privacy-conscious data sanitization without root access. Mull offers a hardened, privacy-oriented web browser based on Mozilla Firefox, incorporating Tor Uplift for onion service detection and arkenfox-user.js preferences to enhance tracking resistance. Deblobbed to remove proprietary components, it supports Android 7.0 and above, prioritizing user control over telemetry and fingerprinting. Distributed through the DivestOS F-Droid repository, Mull serves as a recommended alternative to stock browsers for secure web access. Mulch provides a security-focused and system based on , integrating patches from the project (used in ) along with additional hardening measures. It tracks upstream releases closely for rapid vulnerability patching and supports 8.0 or later, making it suitable for embedded in apps. Available in the official repository, Mulch complements Mull by offering a Chromium-based option with reduced .

Technical Specifications

System Base and Modifications

DivestOS serves as an unofficial soft fork of , a custom distribution derived from the Open Source Project (), enabling it to leverage AOSP's open-source codebase while incorporating LineageOS's enhancements for broader device compatibility and user features. This foundation allows DivestOS to maintain core functionality without relying on proprietary services, as it excludes integration with Google Apps (GApps) and instead promotes alternatives through its default inclusion of the unmodified app repository. As of the final update in December 2024, production builds of DivestOS are based on , corresponding to 20, providing a stable platform for privacy and security-focused modifications without advancing to later Android versions post-discontinuation. A primary modification involves extensive deblobbing, where over 700 proprietary binary blobs—non-free firmware and drivers—are systematically removed during the build process using a dedicated script, thereby reducing the system's attack surface and aligning with libre software principles by minimizing dependence on closed-source components. This includes targeting elements like Broadcom Wi-Fi drivers and other vendor-specific binaries where feasible, enhancing both privacy by limiting telemetry-capable code and security by eliminating unpatchable proprietary vulnerabilities. Complementing this, DivestOS integrates a custom hosts file that blocks connections to over 900,000 known advertising, tracking, and malware domains, serving as a foundational privacy guard against network-based surveillance without requiring user intervention. Security enhancements build upon by applying monthly patches synchronized with upstream and updates, ensuring timely mitigation of vulnerabilities across all supported devices regardless of hardware age. Privacy guards are further augmented through inherited and customized permission controls from , allowing granular management of app permissions, alongside additional hardening measures like automated CVE patching for user-space components. For , DivestOS retains 's customization options, including theme engine support for icon packs, color accents, and font changes, enabling while preserving the system's security posture. The update mechanism emphasizes reliability with over-the-air () delivery for both security patches and feature improvements, supporting seamless installations without data wipes across major versions where possible. Incremental updates are implemented for select devices to minimize sizes and usage, facilitating ongoing maintenance for older through layers that adapt components to legacy architectures. This architecture underscores DivestOS's commitment to extending device usability while prioritizing from encumbrances.

Kernel and Hardware Support

DivestOS employs custom kernels derived from , tailored for each supported device with extensive backported security patches to mitigate vulnerabilities. An automated CVE checker and database systematically applies fixes for over 5,800 security issues, ensuring comprehensive coverage across builds. For example, device-specific kernels, such as those based on 4.9 for models like the , incorporate 50 to over 1,100 additional patches per release, including backports for recent CVEs in series like CVE-2023-XXXX. Hardware support in DivestOS prioritizes open-source components, minimizing reliance on drivers by removing over 700 vendor blobs during the build to reduce potential risks. This deblobbing strategy favors fully open-source alternatives for peripherals like and , though essential is retained where unavoidable for functionality on . Workarounds are implemented for specific integrations, such as display driver stability fixes on devices and camera/GPS optimizations on older models, enabling compatibility without compromising core security goals. The system targets architectures primarily, supporting over 100 devices ranging from modern flagships to end-of-life models like the Samsung Galaxy S5. Key limitations arise from this hardware-agnostic approach: hardware attestation mechanisms, such as SafetyNet, are unavailable on non-Pixel devices due to the custom nature of the and modifications, preventing certified status for apps requiring it. Older kernels (e.g., versions 3.x to 5.10) persist for legacy compatibility, receiving automated patches but lacking full upstream advancements in newer releases. relocking is restored and tested on 23 devices and available for 26 additional devices; verified boot is restored on 36 devices, though not all hardware fully supports incremental updates or the latest .

Device Support

Compatible Devices

DivestOS provided official support for approximately 170 devices across seven Android versions, primarily those compatible with , ensuring broad coverage for both modern and legacy hardware. These devices spanned various manufacturers, including , , , , , , HTC, and others, with monthly security updates delivered until the project's discontinuation in December 2024. Full support was available for the Google Pixel series from Pixel 2 through Pixel 7, including models like the Pixel 2, 3, 4, 5, 6, 6a, 7, and 7a, which benefited from verified boot and relockable bootloaders for enhanced security. Legacy devices such as the Nexus 5 (codename: hammerhead) and Samsung Galaxy S5 (codename: kccat6) received extended maintenance, allowing end-of-life hardware to remain viable with privacy-focused modifications. Other notable examples included Samsung Galaxy models like the S9, S9+, and Note 9; OnePlus devices from the 5, 5T, 6, 6T, 7, 7T, 8, and 9 series; Xiaomi's Mi 8, Mi 10T, Poco F1, and Poco F3; and Motorola's Moto G and Moto X series. Compatibility required devices with unlockable bootloaders and publicly available device trees from , while excluding those dependent on excessive proprietary firmware or blobs to maintain open-source integrity. Installation typically involved via a custom such as TWRP, followed by the official build files, which remain accessible through archived repositories post-discontinuation.

Support Lifecycle

DivestOS provided extended support for end-of-life devices, significantly outlasting typical vendor update timelines of 2-3 years by maintaining security patches for hardware up to a decade or older. This approach emphasized prolonging device usability while prioritizing privacy and security enhancements, allowing users to continue operating legacy hardware without immediate need for replacement. The project delivered monthly security updates to all supported devices, drawing from the latest releases to incorporate upstream fixes. Feature updates were aligned with (LTS) branches, ensuring compatibility and stability over time, while DivestOS continued providing security maintenance for devices even after LineageOS officially ended support for them. Select devices also benefited from incremental update mechanisms to reduce download sizes and improve efficiency. Support for individual devices persisted until hardware constraints, such as inability to boot newer versions or unpatchable vulnerabilities, rendered further maintenance impractical. This policy remained in effect until the project's discontinuation in December 2024, after which no further updates were issued. A distinctive element of DivestOS's strategy was its commitment to revitalizing legacy hardware for purposes; in April 2022, support was added for over 25 additional legacy device variants across multiple versions, including models like the and , to mitigate security risks for users reliant on older equipment.

Reception and Legacy

Critical Reception

DivestOS received praise from tech communities for its emphasis on enhancements and extended support for older devices, positioning it as a viable option for users seeking to extend the usability of end-of-life hardware. In a 2023 review by security researcher Mike Kuketz, the operating system was described as "privacy-friendly" with "increased security," highlighting its hardened , removal of , and inclusion of features like verified boot on supported devices. Community discussions on Reddit's r/PrivacyGuides subreddit echoed this, noting DivestOS's role in providing "enhanced and security along with support for many older devices." Similarly, Privacy Guides recommended it as an derivative focused on , appreciating its long-term maintenance for obsolete phones. Users and experts often characterized DivestOS as a "" solution for aging devices, allowing continued secure operation beyond manufacturer support cycles. On Reddit's r/PrivacyGuides, contributors emphasized its goal of mitigating vulnerabilities to enable safer use of older hardware, such as devices, without requiring hardware upgrades. The praised its monthly security patches across multiple versions, enabling longevity for end-of-life phones that would otherwise be vulnerable to exploits. This approach was seen as particularly beneficial for budget-conscious users or those in regions with limited access to new devices. Criticisms centered on its development model and security trade-offs compared to more specialized alternatives. As a single-developer project led by its creator for over a decade, DivestOS faced concerns about sustainability and potential risks from limited oversight, with community members on Privacy Guides noting the discontinuation in late 2024 as a significant loss due to this reliance. Experts on the GrapheneOS discussion forum argued it was less secure than GrapheneOS, attributing this to its broader device support inherited from LineageOS, which introduced stability regressions and fewer hardware-specific hardenings. Additionally, its delayed adoption of Android 14 drew scrutiny in 2024, with Privacy Guides users pointing out that it remained on Android 13 for months despite the newer version's availability, potentially exposing users to unpatched vulnerabilities. In developer forums, DivestOS garnered high ratings for ease of installation and daily usability, particularly among non-expert users. On XDA Developers, forum threads highlighted its "slimmed down" interface and straightforward setup process, with one user expressing being "very impressed" by its privacy improvements without compromising functionality. Comparisons frequently favored DivestOS over /e/OS for security, with discussions on the /e/ community forum and Kuketz's analysis noting its superior hardening measures, such as kernel mitigations, while critiquing /e/OS for weaker protections despite easier onboarding for beginners. Media coverage underscored DivestOS's contributions to device longevity and de-Googling efforts. A 2022 thread on its for end-of-life devices received positive reception, with commenters appreciating the restoration of verified boot and monthly patches for 45+ models, though some noted hardware limitations as ongoing challenges. In 2023 reviews focused on de-Googling, creators like those on privacy channels emphasized its effective removal of services via alternatives, making it accessible for users transitioning from stock without sacrificing core features.

Awards and Recognition

In 2023, the (FSF) awarded its 2022 Award for Outstanding New Free Software Contributor to Tad (SkewedZeppelin), the chief developer of DivestOS, recognizing their significant contributions to mobile through the project's development as a privacy-enhanced distribution. DivestOS received further recognition in open-source communities, including its initial public release announcement on the forum in June 2020, where it was highlighted for providing long-term device support with enhanced privacy and security features based on . The project was also recommended by privacy-focused organizations such as Privacy Guides, which listed it among the best custom distributions for its support of verified boot on non-Pixel devices and inheritance of device compatibility. Additionally, the Digital Privacy Shop featured DivestOS in detailed setup guides and a 30-day usage review, praising its installation process and suitability for de-Googled mobile environments. Tavi, the sole maintainer of DivestOS since , earned acclaim in the community for single-handedly sustaining a complex, full-time passion project that influenced subsequent discussions on privacy-oriented forks and extended device lifecycles. The FSF specifically noted DivestOS as a notable soft of in its award announcement, underscoring its impact on advancing principles in mobile operating systems.

Post-Discontinuation Impact

Following the discontinuation of DivestOS in December 2024, the community responded by archiving key resources to preserve access to its builds and applications. Users and contributors uploaded the final official applications, including tools like and Carrion, to the , ensuring historical availability for those still relying on the ROM despite the end of support. Community forks have continued development of select applications, such as MaintainTeam's malware scanner and IronFox for the Mull browser, providing ongoing updates as of 2025. Discussions in technical forums highlighted users' migration to alternatives such as and , with many expressing disappointment over the loss of long-term support for legacy devices but appreciating the decade of enhancements provided. The project's end influenced subsequent efforts in the privacy space, particularly for support, by underscoring the need for community-driven on end-of-life hardware. Non-mobile tools developed under the Divested umbrella, such as deblobbing utilities for browsers like Divested-Deblob, continued to receive maintenance, addressing ongoing gaps in web privacy beyond operating systems. DivestOS left a lasting legacy through its innovative technical contributions, including the first unprivileged implementation of , which allowed compatibility without system-level privileges starting in July 2023 on version 17.1 and later. This approach, enabled via a simple settings toggle and installation, improved sandboxing for privacy-focused users but was not recommended for broad adoption due to reliance on proprietary libraries. Additionally, its automated CVE patching applied hundreds of security fixes per device, enhancing protection on unsupported hardware, though specific adoption in other projects remains limited. The single-developer model of the project also raised broader awareness of sustainability challenges in open-source , prompting discussions on funding and collaboration needs within the ecosystem. As of 2025, no official takeover or community fork of DivestOS has been announced, though archived code on and suggestions in developer communities indicate potential for adaptation into projects like to extend legacy device viability.

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