Redmi Pro 4 suddenly asks for 4-digit password - NEVER set one

[vamp012]

Hi! Apologies if this question has been asked already, but my phone suddenly asked for a password this morning - wasn't turned off and on before, nothing that would explain this. It never asked for a password before and I never set one. I tried the 'find device' option on mi cloud but sadly isn't enabled. Just wondered why would my phone do this as now digging for internet data it is clear that all my data will be lost when I manage to reboot the phone. Btw alarms still work and the phone even blinks green when there's a new message. Just can't get in. Thanks for your time, guys, all answers are appreciated.

 

[Pertti Kosunen]

Try your PIN number.

 

[vamp012]

Try your PIN number.

It's the first thing I did, obviously. But the PIN is from my mobile provider - and the PIN the phone asks for is something completely different. The two aren't related.