Pocaphone F2 - it doesn't find my mobile network - cant add apns


Dec 6, 2020
Hello. Couldn't find proper thread.
I have following problem with my phone -
Just bought F2 pro in Poland, and have following problem:
I am on the newest MIUI version 12.0.3 global stable. Tried both factory / hard reset, resetting network settings but nothing.
Mobile can't find my mobile network (it's Plus - one of the largest in Poland). I can't manually add APN because I have following text "Access point name settings are not available for this user" and even If I add APNS - they are not visible in the settings.
I have no idea what to do more except sending it back to the shop.