Fastboot Mode Switching Off After A Few Seconds

May 12, 2016
today i received my unlock sms from xiaomi. i downloaded the unlock app and set my mi5 to fastboot mode. but after 10-20 seconds it automatically switches off, it doesn't stay in fastboot mode.

i am running the device with 6.5.7 china dev rom, had the same issue with china dev 6.4.21. before that i also flashed china and global stable via fastboot edl mode, but that left me in bootloop. so i flashed 6.4.21 dev via fastboot edl and it worked like a charm for 2 weeks.

as said, i received my unlock but all of a sudden, my device doesn't want to stay in fastboot anymore. any ideas how to solve this?