Developers have targeted the Lumia 520 (and its close relatives like the Lumia 521, 525, and 720) for years. The two main paths for custom software installation include Android and Windows 10 Mobile. 1. Android Ports (LineageOS / CyanogenMod)
Here’s a concise, practical answer that pieces together the key points about :
By bypassing factory locks using specialized modding software, developers and tech enthusiasts can flash custom builds of or even lighter distributions of Android (CyanogenMod / LineageOS) directly onto the hardware. Why Use a Custom ROM on the
Stable basics (display, touch), allows apps like basic web browsers, Spotify, or simple games.
Developers modify the registry of the phone to spoof its identity, making Microsoft update servers recognize it as a Lumia 550 or 640. Alternatively, a pre-baked Windows 10 Mobile FFU (firmware image) can be flashed via WPInternals.
: Flashing a new ROM will erase all settings, pictures, and data. Use the Windows Device Recovery Tool to save a recovery image first. Disable Encryption : Ensure "Device encryption" is turned off in Settings > Update & Security to avoid conflicts during the unlock process. Required Files : You will need the original FFU firmware image for your specific model (e.g., RM-846) and matching Flash Loaders Unlocking the Bootloader Install WP Internals : Download and run the tool on your PC. Connect Device : Plug your Lumia 520 into your PC via USB. Flash Mode : Use the tool to switch the phone to Flash Mode
⚠️ The Lumia 520 runs Windows Phone 8/8.1 , not Android. Custom ROMs here are not like Android custom ROMs (LineageOS, etc.). You cannot install Android on a Lumia 520 (except very unstable, outdated experimental ports). This guide covers what is actually possible.
During the early beta phases of Windows 10 Mobile, Microsoft included a compatibility layer known as Project Astoria, which allowed Android APKs to run natively on Windows phones.
To start any custom ROM work, you need specific software to interface with the Lumia's locked filesystem: