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Nokia Lumia 620 (nokia-sand)

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Nokia Lumia 620
The Nokia Lumia 620 powered off.
The Nokia Lumia 620 powered off.
Manufacturer Nokia
Name Lumia 620
Codename nokia-sand
Released 2013
Type handset
Hardware
Chipset Qualcomm Snapdragon S4 Plus (MSM8227)
CPU Dual Core 1.0 GHz Krait
GPU Adreno 305
Display 480x800 TFT LCD
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
postmarketOS
Category downstream
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
no
pmOS kernel
The kernel version that runs on the device's port.
3.4.0
Device package device-nokia-sand
Kernel package linux-nokia-sand
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).
Broken
Battery
Charging and battery level reporting works
Untested
Screen
Display works. Ideally with sleep mode and brightness control.
Works
Touchscreen
Untested
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

Contributors

Maintainer

Users owning this device


Button Shortcuts

  • Hold Power + Volume down to force the phone to reboot
  • Hold Volume down and connect it to the PC to boot it into fastboot mode
  • Hold Volume Up and connect it to the PC to boot into the recovery system

Installation

Tools

Backup Data

Postmarketos is not ready to use as a daily driver yet. So use a phone you do not need for the development. If you have some data on it, back it up now.

Clean Firmware Install

Use the Windows Device Recovery Tool to install clean Firmware. This is to avoid errors and to gain the FFU-image.

Warning WARNING: Check you Storage! Open WPInternals with your phone connected to your Windows PC. Reboot it into flash mode, to get more information. There it says, from which manufacturer your storage is. If it is from Samsung, it can cause a brick of your phone. If not, you are good to go.

Unlock the bootloader

Now use WPInternals to unlock your bootloader. You will need an FFU-image for that. Use the Download page of WPInternals to download it.

Afterward, you need the Emergency Loaders. You can also download the needed files with the Download page.

Then you need the Engineering SBL3 files, which can be found here Now unlock the bootloader.

Connect your phone in mass storage mode

Use WindowsPhoneInternals to switch to the mass storage mode. It could be that you have to give the device a drive letter.

Backup your phone

Use the WindiskImager to Backup your phone (the MainOS Partition). Therefore select the Device, select a folder for your Backup and give it a name. Afterward, switch to Normal Mode again by holding down the volume down and power key together for 10 seconds.

Flash the LittleKernel Bootloader

To boot to Android you need to flash the LittleKernel of Android4Lumia. Therefore use the iflash tool.

From here you can boot into the bootloader and follow the [[I

Troubleshooting

If your device stays black but is connected as QSUSB_DLOAD, use the WindowsDeviceRecoveryTool to make a clean firmware install.

Kernel configuration

  • CONFIG_USB_G does not show up, but it is described as required for USB-Networking
  • CONFIG_PFT, CONFIG_USE_VFB and CONFIG_KINETO_GAN do not show up in menukonfig. This options should be disabled due to the Kernel configuration guide.

See also