I had the same problem. Since I couldn’t find anything in the settings, I contacted support. After a day of chatting, it was clear that the problem could not be solved by me. So I was allowed to send in the FP4. Now I have had it back since yesterday. It seems to work with the original operating system. But since I want to install an alternative OS, which FP recommends, the bootloader has to be unlocked with the IMEI and the serial number. The FP website no longer recognises my data from the phone and I cannot generate an unlock code. I wonder if this has something to do with the mainboard that FP says it replaced or with the website’s service for the code, which doesn’t always seem to work. Has anyone else here had this problem?