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SIS 650 - Asus P4S8L - Trying to update VBIOS

Posted: Mon Dec 24, 2007 9:47 pm
by vrolijk
Hi guys,

Just got a 22" widescreen for my parents machine, which unfortunately has the crippled SiS 650 IGP. I flashed the latest official Asus BIOS, 1010 - this brings the VBIOS to 1.15.26 - not recent enough for widescreen support. The direct download link is: ...

I tried to hack in the more recent 2.30.01 VBIOS - fiddled with all the Asus specific checksums and got the Asus windows flasher to accept it. The PC bricked on booting, claiming invalid checksum. I managed to flash back to 1010 through the boot block code (which luckily wasn't crippled.)

I suspect that since the compressed portion of the BIOS is shorter (VBIOS 2.30.01 is 32K while 1.15.26 is 48K,) some entry point into the compressed section changed and the BIOS tanked. Another weird thing - there is a second copy of the compressed VBIOS towards the end of BIOS, right in the middle of the uncompressed pure binary section.

Anyway, if anyone has any ideas or could give me a hand, it would be much appreciated.

Edit - Removed extra URL tags for clarity. KW

Posted: Tue Dec 25, 2007 8:28 pm
by vrolijk
Got it figured out - I finally found a copy of the Asus specific CBROM in the BNTBTC collection. I managed to replace the VBIOS in the compressed section - apparently the VBIOS in the bootblock is only used during the boot sequence. The windows driver now reports VBIOS version 2.30.01 and allows all the widescreen resolutions. Woohoo :-)

Posted: Thu Dec 27, 2007 3:25 pm
by Jimmy.Bellefroid

can you please send me your patch and a littile bit of explanation.
I'm not that great of a Bios Flasher :oops:

I really need it, because I have a terrible pain in my eyes at the end of the day...


Posted: Mon Dec 31, 2007 2:58 pm
by cp
patched bios sent.

Posted: Fri Jan 11, 2008 1:09 pm
by antonio
Can i also get the patched bios ?


Posted: Fri Jan 11, 2008 8:56 pm
by cp
patched bios sent.

Posted: Sat Jan 19, 2008 1:10 am
by almope

Same motherboard and the same problem.
Follow provided instructions without luck.

The path of the bios update is the same: ...
(i've flashed this but nothing)

Can you please send me a patched bios?


Posted: Mon Jan 21, 2008 11:37 am
by romga
Hi guys,
Same motherboard and the same problem :(
Can you please send me this patch and a littile bit of explanation too.
Thank you in advance!

My e-mail removed by cp

Posted: Tue Feb 05, 2008 7:45 pm
by prdlajs
would it be possible to send me the P4S8L patched bios too?

Thank you.

email address removed by cp

Posted: Tue Feb 05, 2008 11:24 pm
by sp-am

same board, same problem...

could you please send me a patched bios too ...


Posted: Fri Feb 08, 2008 9:23 am
by prdlajs
Yesss, successfuly flashed, now the P4S8L supports the 1680 x 1050 resolution of my Benq FP202W, tested under Win XP and Kubuntu - both works great.

Many thanks for your help.



? Black screen after flashup ??

Posted: Sat Feb 09, 2008 7:28 pm
by sp-am
I got a black screen after flashup.
With some effort and a PCI VGA card I got a bright screen again and flashed it back to my old bios.

Any suggestions ?

Regards ...

Posted: Mon Feb 11, 2008 9:23 pm
by raktas
Same board same problems :(

Can I get patched bios too?


Posted: Tue Feb 12, 2008 10:26 pm
by cp

Posted: Wed Feb 13, 2008 10:07 pm
by raktas
thanks. ir worked fine :)