You have to let the burner program do it.
Regarding the spare chip, any will do that has the same part number as yours. Let me explain:
Boot into Dos, remove the original Bios chip, (bios is in memory by now) replace with the "donor", Flash it.
Reboot as you do and if all went well, you have your original chip safe as a backup.
If the flash went wrong, as it can, turn off and replace your original chip and you lose nothing.
You could allways try again.
It does work, believe me.
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