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#11
You have complete instructions in the manual, ECS > C51PVGM-M (V1.0)
there's no one way fits all when it comes to BIOS update. Every type is different. Looks like it works only using diskette and you'd be wise to buy a brand new one if you want to proceed, they are sooooo unreliable.
I also looked at that only BIOS update and there's nothing about USB compatibility. I would advise not to do it.