1. All of the following information applies only to devices with the Android 11 firmware. So update yours to Android 11 if you haven't already
2. Unlock the bootloader (This will wipe all data so make sure to backup first)
   • Make sure the phone is connected to internet
   • Enable developer options
   • In developer options, enable OEM unlocking
   • Boot into download mode
     • With the phone off, hold both volume keys and plug your device to a computer. Release the buttons once you see a blue screen
   • Hold Volume Up for about 7 seconds then let go of it
   • Press volume up once to confirm bootloader unlocking process (This will erase all the data in the phone)
3. Download a GSI, make sure it's ARM64 A/B. Its file extension should be ".img" if its a zip, tar or xz (whatever) it probably needs to be extracted.
4. Download an empty vbmeta (to disable secure boot verification)
5. Boot into recovery mode (adb reboot recovery or turn on the phone holding the volume up & power key)
6. Press factory reset, erase cache partition and then Reboot to bootloader (to boot into download mode).
7. With the device in download mode, flash the GSI and VBMETA using your preferred method:
   • Heimdall (Windows/Linux): Run heimdall flash --SYSTEM <gsi.img> --VBMETA <vbmeta.img>. Note that Heimdall on Windows might require you to install some drivers.
   • Odin (Windows): Rename the GSI to system.img.ext4, rename the VBMETA image to vbmeta.img, add both to a TAR file & flash it in the AP slot. Note that some versions of Odin might not work properly.

The bootloader of this device has a bug where it refuses to load modified boot or recovery partitions. If you ever plan on modifying them (for example to install Magisk or TWRP), you need to "fix" the boot/recovery image first. More information here

*-Bluetooth file transfer works ONLY if you are sending or receiving files from a device with bluetooth version newer than 2.0, and connecting to more than one device at once can cause bluetooth to become buggy.

**-MTP works on a modified kernel with this patch and this patch and a magisk module that reverts this patch

***-In-call audio functionality depends on the GSI, the one linked below is tested to have call audio working just fine.

****-On the GSI linked below, Fast Charging only works when device is fully powered off (in the Offline Charging state), it also works on other GSIs (see Android 14).

Tested By: InsertX2k - On SM-A207F/DS(EGY), Build Number - A207FXXS5CWF1

GSI Tested: LineageOS 20.0 TD-Based (arm64 a/b vndklite GSI with Gapps and No SuperUser)

Note: Android 14 QPR2 and QPR3 GSIs don't boot. This is probably caused by the same issue preventing Android 15 from booting (more info below)

GSI tested: android_14.0.0_r27 ci-20240226 TrebleDroid

To boot Android 15 GSIs, you need a custom kernel with this fix.

GSI tested: android_15.0.0_r9 ci-20250117 on an A207M/DS with permissive SELinux