This must be an issue with any of your apps. I use this ROM on two devices (my wife's and mine), both running for at least two days on battery.
Hint: Don't use any battery saver app!
Points to check:
- latest ROM version
- latest Mi Unlock Tool
- Mi account details entered in phone
- some users had to wait up to ten days. I personally unlocked straight after receiving the message without any problems.
When did you receive the unlock permission? Some users had to wait up to ten days to be able to unlock.
Did you enter your Mi account detsils in Settings - Mi account? You'll have to use the same account as in the unlock tool.
Did you download TWRP image file and rename it to recovery.img?
I recommend 3.0.2 by cofface https://forum.xda-developers.com/xiaomi-redmi-3s/how-to/share-twrp-3-0-2-developed-cofface-t3471201
You can only unlock bootloader, if your device runs the latest official ROM. I think you'll have to make a deep flash cable to install an official ROM.
I don't see that issue either. I dirty flashed from 8.1.5 xiaomi.eu to 8.2.3 ********.com (which is based on xiaomi.eu) without any issues.
@Weissnix You should probably do a complete wipe to get rid of your problems.
@eddiec
Did you try to make a QCN backup of your B20 device, change the IMEIs and MAC inside the QCN file and restore it to your non-B20 device? This might do the trick.