Depending on just where your friend is actually located a good web search with "sony support" as the term on just about any search engine will see a ton of links for different locations since Sony is global.
If the system is seeing problems or as usual an update will include fixes then you would take a good look at the latest available. First you make a backup of the current prior to appliying the update.
Along with just the latest bios revision you also have to consider all other updates for the prebuilt. In the long run it will be strictly upto the owner to decide there.
Well even if you have a backup you probably won't be able to use it. Your mobo is probably made to go in sony computers only and the actual mobo manufacturer doesn't support it. Sometimes though you can find an exact replica that the manufacturer calls something different and flash it over your current way to unlock ALOT more BIOS settings/options. BUT it doesn't always work out...
cant be flashed. hes having alot of problems with this old pc.its all this guy can afford right now or i would tell him just to build one or ill do it..he just got a x8 AGP FX- 5200 128 MB card from another guy in our gaming clan and no matter what he does when he installs the drivers he keeps getting memory dumps. think the cards bad? it works then dumps then reverts to old settings
If the original card was an AGP card and swapping in the 5200 causes the error, then yes, the 5200 is bad or the PC doesn't like it for some reason.
Try a different AGP card or stick with the original card.
Good suggestion.
Run memtest on his PC for a while. If it has multiple memory chips, you will need to test each one individually.
If the memory passes, the used video card still could be suspect.
If your friend is trying to install an incorrect set of drivers meant for newer models that would explain the blue screens and memory dumps. A bad slot on an old board wouldn't be a ny great surprise either unfortunately.
As far as finding an Asus board in a Sony that's no more a surprise then seeing them in HP or some other premade system. The problem is the need to go to them not Asus for driver/software support since those are ordered specific for that brand and those mose models won't be found on the usual Asus support site itself.