[HELP] can not enter bootloader; stuck at Asus logo after failed update via adb

Please help Im using xFSTK DOwnloader 1.7.0 but always in failure:

FW+OS download did not complete.

it stops at Firmware download completed. Continuing to OS...
after that the phone will boot but stuck at Asus Logo

Cant enter the boot loader either,
via Power Button + Volume Up.

problem emerged when I flashed the recovey, boot, and droidboot of official Marshmallow update

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