Microsoft Lumia 640 DualSIM (microsoft-dempsey)

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Microsoft Lumia 640 Dual SIM
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Manufacturer Microsoft
Name Lumia 640 Dual SIM
Codename microsoft-dempsey
Released 2015
Category testing
Original software Microsoft Windows Phone 8.1
Hardware
Chipset Qualcomm MSM8926 Snapdragon 400 (28 nm)
CPU Quad-core 1.2 GHz Cortex-A7
GPU Adreno 305
Display IPS LCD capacitive touchscreen, 16M colors 5.0 inches, 68.9 cm2 (~67.6% screen-to-body ratio) 720 x 1280 pixels, 16:9 ratio (~294 ppi density) Corning Gorilla Glass 3 ClearBlack display
Storage 8GB
Memory 1GB RAM
Architecture armv7
Non-Android based device
Features
USB Networking
Flashing
Touchscreen
Display
WiFi
Xwayland
FDE
Mainline
Battery
3D Acceleration
Accelerometer
Audio
Bluetooth
Camera
GPS
Mobile data
SMS
Calls
USB OTG


Contributors

  • Maxnet

Maintainer(s)

  • Maxnet

Users owning this device

  • Maxnet (Notes: trying to get the bootloader unlocked)
  • Nobodywasishere (Notes: Actually the AT&T LTE model but close enough)


Random thoughts

There is a way to get linux to boot on the device. Porting edk2 is needed, it is described in this guide : https://github.com/konradybcio/Lumia-EDK2-Guide. Also this edk2 would probably work with some small modifications : https://github.com/Dominduchami/Lumia830Pkg. Unfortunately there is no efistub or efiframebuffer support in the newest msm8226 kernel, so backporting it is required to get pmOS to boot on it.

If you got some information regarding this, please add it here.

It's possible to unlock the bootloader using WPinternals here, the device needs to be on Windows 10 Mobile. From there it may be possible to get an LK bootloader following this guide here (lk and boot shim). There is a Telegram group chat for Android4Lumia that may have more information that I missed on my brief skim through it here.


See also