HTC Max 4G periodically asks for password

Question

HTC

In fact, the correct hub would be "windows mobile", but there is no such hub anymore.

I have an old htc max 4g, windows mobile 6.1 system; about once a month it suddenly requires you to enter some kind of password to unlock it. Helps to remove and insert the battery.

I asked on w3bsit3-dns.com what this password is and how to remove it, they advised me to hard reset. I did this hard reset 2 times - it did not help.

Can I somehow find out the password, change, reset?