yeah you cant do it in windows i guess, sorry i was wrong about that, on some motherboards you can do that though but not with yours.
you could use a thumb drive, flash card, like the kind in a camera, if yo ucan put it in your computer that is, like using a flash card to usb adapter for instance.
Stick a thumb drive into a usb port, itll show up or pop up in your My Computer area
Select it or highlight that thumb drive, then right mouse click on it to pull up a menu, select "Format" -- a new window pops up, leave every thing alone accept for file system area, change it to FAT if it isnt on FAT already, select "quick format" this will wipe the thumb drive clean and give it a proper file system your bios flash utility can read, and press the OK/Start button.
Then you put your bios rom file using a drag n drop or copy/paste onto the thumb drive.
Reboot, enter your bios (leave the thumb drive plugged in)
Scroll to the Tools menu, select the EZ Flash utility and press enter
the utility will launch, navigate to the thumb drive in the new window using the keyboards arrow keys (or mouse if it lets you) now select the 1502 rom file, navigate to the "flash bios" button or similar, not sure i remember what it says, and initiate the flash, it will take maybe 30 or so seconds to flash the bios but it should provide a indicator bar of its progress.
After that i'd say your done, it will power cycle "shut off, turn itself back on"
at this point remove the thumb drive.
go into your bios and you may have to setup things again such as an overclock setting, or other settings you may want again, hard drive boot order..etc..
then save & exit and your all done
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if it fails: your computer will power cycle, shut off, turn on and show nothing, no post, no video.. now you know there is a problem and you will have to use the crash free bios technology.. im not saying this is going to happen, but this is a just-in-case scenario so you know what to expect ahead of time and how to deal with it.