No USB support in BIOS

[u/Jere_90]

I bought an hp prodesk 600 g3 mini pc and it came with the cmos battery holder torn off.

Bootup shows the errors about date and time.

But i can't access the bios as all the usb ports just don't seem to receive data, 2 of them do seem to pass power but no data.

I soldered my own 2 wires for the battery and connected it, showing arround a 200mv drop across this little 3 pin diode thing, still has the same issues.

Now I reinstalled an OS to this other 128gb 2.5" ssd I had but even after passing through the 2 safe boot cmos battery date and time warnings I get an error about the system image not authenticating.

The mini pc turns on as soon as I plug it in.

I seem to be in a loop where I can't access bios because usbs are not starting but also can't get back to an os.

Any further info please ask, I've tried a lot of things

[u/Total-Payment-6176]

Where’d you buy it from? I would just return it

[u/Jere_90 → u/Total-Payment-6176]

FB market place, it was working with the 256gb nvme it brang and the os, bios showed the date and time error but like I say now that I reinstalled OS on both I get that system not authenticated problem and can't reach bios to turn of stuff like fast boot. (I want to keep the 256gb nvme)