I've double checked this issue.
Finally it turned out that it is just cosmetic issue.
The last character is just not displayed but still I can unlock my phone
Wprowadzam za każdym razem 4 znaki po zatwierdzenie zawsze dostaję komunikat - niepoprawy PIN. Po kilku próbach pyta mnie o kod PUK. W tym wypadku też wprowadzam wszystkie znaki i to samo.
Jak sobie z tym poradzić?
In polish language I can type just 3 letters SIM CARD PIN, not 4 and i can't enter to the phone after upgrade to 8.1.4.0. Reboot doesn't help. I saw the same issue for spanish and ukrainian...
Device Readmi 4A
How to solve this issue?