It is great news as this time it is different kind of Chinese error message that says: can't unlock bootloader because you still haven't used the phone actively for specified time.
The solotion is easy just unlock bootloader with this Mi Unlock Tool and you will be fine...
Also redesigned MiCloud and extended dark mode for more parts of the system.
Additional dark mode affected parts above the previous build (9.1.24):
- notification shade
- app vault
- contacts and dialer
- screen recorder
- data usage
- manage apps
Download global developer ROM for your device from here: http://en.miui.com/download.html and copy rom.zip to phone internal storage
Open system updater > Choose update package > Install ROM
This is the way how to swith from official global stable to official global develeoper relaase without...
Of course you can't change from official ROM to unofficial ROM via system updater.
I said upgrade from official global stable to official global developer release via system updater in order to unlock bootloader on developer ROM
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