ZD551KL Bootloader locking

Hey, since ZF Selfie doesn't have droidboot, would there be a way to re-lock the bootloader?
I mean, would flashing the original recovery/kernel/rom do the job?
Other zenfone devices require AsusFlashTool and a raw firmware, but that tool doesn't support ZF Selfie.

A few days ago I've got a a problem with my display, I believe it's called screen bleeding.
I heard of some guys that have sent their phones with an unlocked bootloader, but I think I shouldn't take the risk, and have my bootloader locked, so they wouldn't suspect that it's my fault.

Thanks in advance!


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