Same issue here. A FairPhone 4 thread at FP4 - Unable to relock bootloader - #6 by vince31fr suggests installing an avb_key to verify the OS, but I don’t know if a similar approach would fix the issue for FairPhone5, or if such a file exists.
Same issue here. A FairPhone 4 thread at FP4 - Unable to relock bootloader - #6 by vince31fr suggests installing an avb_key to verify the OS, but I don’t know if a similar approach would fix the issue for FairPhone5, or if such a file exists.