In this case, I hold down the power and volume buttons until the name of the phone model appears, but the trick is that as soon as it appears, you need to immediately release the pressed buttons, otherwise nothing will work.
If the answers above do not work, I advise you to try the following:
Hold the shutdown button for 15-30 seconds until the Fastboot picture or vibration turns off.
Using Android SDK Platform Tools (via PC if the shutdown button does not work).
Resetting settings through stock recovery (extreme option, but also working). Hold down the power button and the volume up key.
Exiting the FASTBOOT mode is very easy:
To reboot a phone or tablet with a non-removable battery, hold down Minus and Power for 7-10 seconds.
If the phone re-enters Fastboot mode, either the volume down key is faulty (pressed), or firmware is required
FastBoot is essentially a programming mode for the phone, if you have finished all manipulations with it, you just need to hold down the shutdown button and the phone will reboot itself. There are times when the phone does not want to start in normal mode, then you have to reset the settings, turn on the phone holding the top volume button and the power button, find the Wipe all data menu and select Yes.
To exit it, you need to hold down the shutdown key and hold it for about ten seconds. After that, the smartphone will reboot and start in normal mode. https://phoneoff.ru/instruktsii/fastboot-na-xiaomi
My Xiaomi phone has installed the gboard keyboard update today and got an error that prevents the keyboard from being called up? I can't unlock my phone. Nothing helps, what to do