I've read through the thread "How to make 1st to 3rd Generations of Vaio Z support 8GB" and there are some promising leads there especially from ZugZug an Sniper_Sung but the thread kind of abruptly ends without a clear resolution.
Another thread indicates that the victory was celebrated too early and the 8GB doesn't exactly work.
Updated: Found a better way to backup Bios only, Please see the end of this message
Let say your Vaio Z is using Bios R4040M3 and you move to Bios R4041M3 to use the official VT support. Later on, you want to move back to R4040M3 to use the Advance Menu hack. Unfortunately, you cannot move back as Sony never publish the R4040M3 Bios update. This is my current situation.
I decided to investigate a way to back up the current Bios. Using a program called Universal extractor, I managed to extracted the files in the original Bios update. The bios update uses a program called Insydeflash to flash the Bios. The Insydeflash uses a file called platform.ini to control its setting.
In the platform.ini file, there is a section called [FDFile]. The section [FDFile] has a parameter called BackupName. If we put in a file name here, the Insydeflash should save your current Bios into that file. Unfortunately, I cannot make it work with the Sony supplied Insydeflash. (version 3.38).
I managed to get the newer version of Insydeflash (version 3.72). The newer version has a new ini section called [BackupROM], as the following:
i bought a battery from ebay and the battery came with a disc driver that had to be installed before the battery can work. i installed the driver but what it does is flash the bios with an update for the battery. long story short the battery does not work and will return it but i am having problems now with my video controller does not regognize my video card and reinstalling the original driver does not work and also my network adapter is gone does not see it at all. i treid to flash the bios with the backup that the battery update made but still no success still having problems with the video and network eithernet adapter. i think the update flash screwed up my original bios and i cant find the original bios anywhere. sony website does not have it. does anyone have or know where i can download the original bios for my laptop.
I was applying arctic silver 5 on cpu heatsink today and disassemble my vaio s460 completely.after putting back everything when i power on it give that vaio sound and blank screen. When press F2 its showing Entering setup.....and stuck there.Could be motherboard or CPU problem or RAM?
For even more advanced options (Overclocking, undervolting!) it is needed to disassemble setup executable to figure out where are those items stored. They are definitely inside the setup, but are not accessible even with this unlock.
VSS register which controls advanced menu is now: 0x258 (for old Z, it was 0x25A) - in advanced menu, you can configure SATA controller to IDE/AHCI/RAID, change lots of advanced features etc...
Now, I cannot share my bios dump as the serial number is inside. But I can give you info how to do it................