Ocassionaly (every few days), after shutting down Windows, or Linux, Udoo Bolt does not boot any more till hardware reset of bios. It boots until B4/A0 phase (right lower corner of screen) then hangs. It's not possible to boot. It's not possible to enter bios either (sic!) If I do bios manual reset using switch on the board ( BIOS default recovery switch), the udoo boots properly, without ANY changes to windows/linux/disk mechanism. I suspect this is some kind of bug in the firmware interpreting UEFI values. I tested this behaviour on three different firmwares: * orginall * rc 1.05 * rc 1.06 RC6 (from 22 November) -> this one I use currently.