FP4: easy installer did not lock bootloader after installation, should i lock the bootloader manually after using e os already?

You’ll probably run into this problem (I suppose this is the reason why Easy Installer does not relock the bootloader atm):

No. It IMHO doesn’t help anything as long as bootloader is unlocked - and disabling it hard bricks your device in case anything goes wrong while locking the bootloader.

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