Unlocking Aspire 9800 BIOS

[iserver]

One more question. Is is possible to change vbios in this bios ?

Aspire 9800 has integrated 7300 Go card with vbios ver. "5.72.22.32.18"

I used phoenix tool (Phoenix/Dell/EFI SLIC Mod v.2.58) to update VBIOS in bios image.

I found 3 variation of VBIOS on techpowerup.com
VBIOS for 7300 Go

So, decided to use "5.72.22.46.57" cause it was latest build as I understood.

After unpacking BIOS image, I found that VBIOS for my card is located in OPROM01.ROM block, so I replaced it with new ROM (remaining the same file name). But after flashing BIOS image - I got BLACK screen, so I had to use crisis disk to restore BIOS back. Any ideas what am I doing wrong ? Shall I change any values in other bios blocks before flashing ? There are some strings in BIOSCOD3.ROM about VBIOS, but I don't know - shall I change them ?

P.S

First of all I tried NvFlash for flashing VBIOS, but it says - "supported EEPROM not found".

P.P.S

Thanks for any advices