[ZTE Axon 10 Pro ROMs, Kernels, Recoveries, & Other] bgroins:
DISCLAIMER: Modifying a device may void the warranty on the device. It may also make the device unstable or may completely brick the device. The author does not take any responsibility for your device. Proceed at your own risk and only if you understand what you are doing! Do not attempt if you are inexperienced in flashing Android ROMs or other device modifications.

What this does:

1. Flashes your US-model Axon 10 pro to the official European A11 release which works except in the US except for the modem

2. Flashes the US-model modem after the Europe ROM is installed to bring back cell service and make the phone work with the ROM

What you will need:

Xiaomi MiFlash Tool https://www.xiaomiflash.com/download/

Full EDL image for A2020G https://disk.yandex.ru/d/tFL86aR5ESEVWQ (European flash)

ZTE SD card update to android 11 for A2020G https://oss.ztedevices.com/prod/cn/direct/germany/a10pro4g/A10 Pro 4G SD card software\(414360B1331MyOS11.3.4_A2020GPro_EEA\).zip (European flash)

Full EDL image for A2020U https://androidfilehost.com/?fid=17248734326145680432 (US flash)

Axon 10 Pro \\(Non-5G\\) EDL Tool https://www.androidfilehost.com/?fid=1899786940962580139

Make sure every download completes successfully before continuing.

Steps:

1. Make sure all files unpack successfully

2. Make sure you have the Google USB driver installed

3. Back up anything you need from the phone. Factory reset/wipe your phone, then reboot.

4. Reboot into EDL mode (power on with both volume buttons pressed).

5. Nothing will display on screen in this mode, but if you connect to your PC and run MiFlash (XiaoMiFlash.exe), then refesh, it should show a COM port connection.

6. Using MiFlash, select the "Full EDL image for A2020G" folder, then flash

7. After a successful flash, your phone will boot into the A2020G image. Wait at least 10 minutes. If it gets stuck on the logo screen like mine did, power off and boot into recovery (power plus volume down), factory reset/wipe your phone, then reboot.

8. Connect to Wifi, if you are prompted to install an update, go ahead and do it (I was not).

9. Extract the ZTE SD card update to android 11 for A2020G file on your PC.

10. Connect your phone to your PC as a media device, and copy the extracted update.zip to the root folder of your phone.

11. Go into Settings->System_>Updates and scan for an update. It should be found now and apply the update.

12. After reboot you should now see the "MYOS" logo. You now have Android 11 but need to flash the US modem for it to complete.

13. Unlock developer mode in settings and turn on USB debugging

14. Extract the Axon 10 Pro \\(Non-5G\\) EDL Tool on your PC

15. Extract the Full EDL image for A2020U file and find the modem.bin file.

16. Copy the modem.bin file to \Axon10_EDL_TOOL_v3.2.5\flash\modem.

17. Make a second copy of modem.bin in the same location

18. Name one file "NON-HLOS.bin" and another file "NON-HLOS_b.bin"

19. Run the EDL too "Axon10_EDL_Tool.bat" and connect your phone. Follow the instructions to reboot your phone into EDL mode, or do it manually (power plus both volume buttons)

20. Select the option to flash and then flash only the modem. It should work fine if your file names are correct.

21. Reboot, run through setup, and make sure you turn off automatic updates in settings

22. Enjoy Android 11 and curse ZTE for never releasing a promised update in the US

Full credit to le011

Edit: Fixed wrong URL on full EDL.