Hi, bertarobert73, good hint. Thank You. I tryed MIBeta yesterday already, did not help. Disconnecting the batery sounds like a good idea, but then i don't see the QDLoader 9008 in Devicemanager. I am connecting with a working USB Cabel straight to the PC. I'll try using a different PC to night. PS: What lead to the situation (maby it gives some one else but me a clou): I was on MIUI Stabel 7.5 Global from Vendor. Bootloader unlocked. (MIUnlock Tool said: Nothing to do, bootloader already unlocked) Flashed TWRP via fastboot and adb. Worked like a charm. In TWRP flashed SuperSU for root. (File: UPDATE-SuperSU-v2.79-20161211114519.zip) Rebooted to System. Root worked like a charm. Then reboot to recovery. In TWRP again: flashed miui_HM3SGlobal_V22.214.171.124.MALMIDG_e67fb5fade_6.0.zip flasched SuperSu again. Wiped Cache. Rebooted to system.... and WAM: black like outer space!