I recently unlocked the bootloader on my Wileyfox Swift 2 Plus to take a partition image, as per this answer. I didn't flash the recovery or make any change to the ROM, and the device is not rooted. After a factory reset (to Android 8.1.0, if that helps), I now need to re-lock the bootloader, but
fastboot oem lock renders it unable to boot normally. I can still boot into fastboot mode or recovery, but the phone won't start normally until I run
fastboot oem unlock again. How can I get this back to factory settings, with the bootloader locked?
Note that I'm not interested in reasons to keep the bootloader unlocked. Having the bootloader locked is a requirement for several apps that I need to use, and I'm not going to try to bypass that.