Sorry. I thought you could get into BIOS and then had problems with the update.
Try clearing your cmos: Disconnect the power cord, remove the battery from the motherboard and press the power on button several times. Reinsert the battery, power on, and see if the BIOS will recognize the keyboard.
If that doesn't work you'll have to borrow or buy a cheap ($5 - $10) wired keyboard to enable USB Legacy mode.