How to reset bios to default values when ps2 and usb port is disabled in bios???

Mar 27, 2018
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I accidentally disabled usb and ps2 ports in bios. Now my pc is not recognising keyboard and mouse. I tried the bios jumper trick and removing CMOS battery also but it didn't worked. The pc starts with the earlier bios settings. Can any plz help me out of it. I have ps2 keyboard and usb mouse.