Backup Phoneix BIOS without having a BIOS file?

[Galane]

I have an eMachines T6540 with C51PVGM-M motherboard. eMachines/Gateway never released a BIOS update for this model. WinPhlash refuses to create a backup without having a compatible BIOS file. It won't allow me to access advanced settings.

The Universal BIOS Backup tool does not make a backup that WinPhlash accepts, claims it has Corrupted interface descriptors and Part table signature not found in the Interface. Error code -161

How can I make a good backup to mod and flash back to the board?

Info from CPU-Z

DMI BIOS        
    vendor            Phoenix Technologies LTD
    version            6.00 PG
    date            08/16/2006
    ROM size        512 KB

DMI System Information        
    manufacturer        Gateway
    product            T6540
    version            100
    serial            GCL6A10000384
    UUID            {FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF}
    SKU            unknown
    family            unknown

DMI Baseboard        
    vendor            C51PVGM-M
    model            C51PVGM-M
    revision        unknown
    serial            unknown

[DeathBringer]

Try BIOS for ECS C51PVGM-M.