Nokia Lumia 520 Custom Rom Work //top\\ Link

The essential tool for unlocking bootloaders and flashing custom FFU files.

Before starting any custom ROM work, you must have the following tools installed on your PC: WP Internals (Windows Phone Internals) : The core tool created by HeathcliffXDA used to unlock the bootloader and enable Root Access. LumiaFirmware.com : A repository to download the specific FFU (Flash File Unit) Emergency HEX/MBN files nokia lumia 520 custom rom work