The American Megatrends BIOS of Beelink J45 Mini PC is very rich in features and options, with many items enabled. There are 6 tabs in settings, with douzins of options each: Main, Advanced, Chipset, Security, Boot, Save & Exit. Here you’ll find the unboxing of this great device.
I advise everyone to make a copy of a working BIOS, if possible, before doing BIOS experiments. To do that you can simple use the provided Aptio AfuWin64 software. If you disabled USB in the BIOS, or if you did another mess in device BIOS, only overwriting NVRAM can reset BIOS settings. In this way, there is no need to open the case, to teardown the device to be able to reset the CMOS. All the actions are made from Windows environment, so your Mini PC has to be able to boot into Windows. All the following actions that are you will do next are entirely at your own risk.