i know now that i m one of the stupids persons on mars. me get into bios, and switched the usb ports vom EHCI to XHCI, then they stopped working. also i switched off the emmc. the device comes up to the insyde bootloader, then after a while "could not access emmc" on windows 10 or bootloop if android. put out the battery wouldnt clear the bios, so im not as good in solding, maybe someone knows the "cmos clear" bridge for this board?! (if there is one) ... now its only text startup with "press esc or f2 to enter setup", but my usb keyboard wouldnt be recognized ir-usb or direct-usb. also there is no recoveryswitch to come into bios again. i think there is one. but .....read the first sentence!
there is power on the usb ports, i seen that on my single usb-numpad devices, that the num led is on, but could not be switched off, otherwise on the keyboard, nothing....
dont touch the f***ing bios on this device, you will not win *G*