P5B Deluxe failed BIOS update, missing operating system

I am in trouble. I just tried to update my bios, here's what happened.
I downloaded the newest bios for my quite old motherboard (asus p5b deluxe) onto a USB drive. Extracted the file and then restarted my pc, went into bios and ran ''ez flash''. p5b deluxe is supposed to be an easy-to-update bios kind of motherboard.
So the ez-flash recognized the bios update i had in store for it and ran the bios update. so far, all good.
Then when the pc rebooted it told me (not immediately, but right before loading onto the ''windows 7 loading screen'') MISSING OPERATING SYSTEM.
So i checked the internet for the problem, long story short..my best shot was to clear the CMOS. So i turned my pc off, took the powercable out, removed the CMOS battery, switched the CMOS pin from 1-2 to 2-3 (for 10 seconds), replaced the pin to 1-2, put the battery back in and started my pc again.
Then it told me something like ''CMOS CHECKSUM BAD'' and ''CMOS SET DATE/TIME''.
So i checked the internet again and set the date and time in my BIOS. I then restarted my pc and now it says (just like before) ''missing operating system'' again!!

What can i do? kind of desperate right now because i'm not looking to replace my motherboard with a new one, and can't RMA it anymore since i've had it for ages. Please help me :)
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More about deluxe failed bios update missing operating system
  1. No, you booted to the usb drive to update the bios so you have to change the boot sequence back to the hdd so the hdd is the priority.

    CMOS checksum bad might refer to a flat cmos battery but it could also refer to a setting in the bios that is not correct. When you take out the cmos battery, all the seetings go back to default including the date & time. The problem with a bios update is that you have to manually reset all the settings (don't forget about the date and dtime).
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