551ML help revert back to original Asus firmware, boot and relock bootloader.

Hi guys, I need your help reverting back to everything original for the zenfone2 551ML (64gb / 4gb ram).
This included;
Getting back the original asus bootloader and relock it
Flash asus original firmware (i have a custom rom now)
Unroot the phone and completely remove xposed as well.

The phone works and boots and does everything fine (except the damned dead lcd that sometimes works)

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