With the end of FP3 software support by Fairphone in august. I have successful migrated my device to /e/OS 4.2. I have used /e/OS Installer. During the installalion process I have noticed that bootloaler has been unlocked. Is it recommended to lock it back manually after the install? If yes how to proceed?
There is the anti-rollback hazard to consider when you relock the bootloader. This is part of the reason that eosinstaller does not attempt to relock; this must be done deliberately with full user awareness.
The process (and possibility of bricking the phone) is described on the manual install page