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Nokia Lumia 720 (nokia-zeal)

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Note This device is still running on armhf, although the processor supports armv7. If you own it, change it and test it that way.
Nokia Lumia 720
Weston running on Lumia 720
Weston running on Lumia 720
Manufacturer Nokia
Name Lumia 720
Codename nokia-rm885
Released 2013
Type handset
Hardware
Chipset Qualcomm Snapdragon S4 Plus (MSM8227)
CPU Dual-core 1Ghz
GPU Adreno 305
Display 480 x 800 IPS
Storage 8 GB
Memory 512 MB
Architecture armv7
Software
Original software
The software and version the device was shipped with.
Windows Phone 8
Extended version
The most recent supported version from the manufacturer.
Windows Phone 8.1
postmarketOS
Category downstream
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
no
Device package device-nokia-rm885
Kernel package linux-nokia-rm885
Features
Flashing
It is possible to flash the device with pmbootstrap flasher.
Works
USB Networking
After connecting the device with USB to your PC, you can connect to it via telnet (initramfs) or SSH (booted system).
Works
Battery
Charging and battery level reporting works
Untested
Screen
Display works. Ideally with sleep mode and brightness control.
Works
Touchscreen
Partial
Multimedia
3D Acceleration
Untested
Audio
Audio playback, microphone, headset and buttons.
Untested
Camera
Untested
Connectivity
WiFi
Untested
Bluetooth
Untested
GPS
Untested
Modem
Calls
Untested
SMS
Untested
Mobile data
Untested
Miscellaneous
FDE
Full disk encryption and unlocking with unl0kr.
Untested
Sensors
Accelerometer
Auto screen rotation works in desktops e.g. Phosh or Plasma Mobile
Untested

Basic info

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: [ 118.028] (EE) Segmentation fault at address 0x4

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.

Community Info

postmarketOS users that own the device

  • Deathmist (Notes: Running last official WP 8.1 build, mostly unused sitting in a drawer)
  • Vicenre22


Contributors

  • magnusgulin