Nokia Lumia 720 (nokia-zeal)

Basic info

 * More specs
 * LittleKernel Bootloader
 * Kernel source

Additional info

 * Possible emmc corruption when flashing? From Android4Lumia page: My phone has Samsung eMMC, can I still use this? You can, but be aware, that those eMMCs are more probable to die unexpectedly than Hynix or Toshiba ones. . Files are randomly corrupted on my device as well.
 * Booting from SD card failed as the files there also seems to become corrupted. 2GB Kingston seems to work without problems
 * X crashes:

Unlocking / installing bootloader
Bootloader is unlocked with a open source windows application, WP Internals. Windows Device Recovery Tool (thor2.exe) is also needed. Here is a video describing how to backup the phone, install littlekernel bootloader, and finally installing twrp recovery and lineageos. The device can be flashed with normal fastboot application after this point.

Key combinations with original bootloader
TBD

Key combinations with littlekernel bootloader

 * Recovery: volume up (phone needs to be repartitioned, and recovery must be flashed)
 * Fastboot: volume down
 * Mass Storage mode / QHSUSB_DLOAD: both volume buttons

Installation
Setup chroot. Select nokia-rm885 as device. pmbootstrap init

Build rootfs pmbootstrap build device-nokia-rm885

Build kernel pmbootstrap build linux-nokia-rm885

Flash rootfs (Note, this will install rootfs to system partition. You can optionally try to install to userdata partition with --partition userdata argument. In that case you should probably erase system partition with "sudo fastboot erase system") pmbootstrap flasher flash_rootfs

Flash kernel pmbootstrap flasher flash_kernel

Run kernel (or you can just restart phone manually) pmbootstrap flasher boot

Tips & tricks

 * Depending on current mode the phone will not restart if the cable is plugged in. Unplug the usb cable and hold volume down + power for 30s. After that, release volume down and then power.
 * Installing from recovery with sideload creates some kind of bootloop with blinking backlight.

Contributors

 * magnusgulin