I have read that if a BIOS upgrade causes malfunction, the only way to bring BIOS to its past STATUS is trought a SIMILAR MB. If I do not find that blessed similar MB, I'll lose mine, I presume. Am I right??Some manufacturers let you downgrade a BIOS to a previous version (i.e.Dell) but it depends on the exact motherboard.

Many people get in trouble flashing a BIOS just because there is a newer version, not because of problems they were having, or increased functionaliy they don't NEED, but just because it is available. When something goes wrong with the procedure it can be disastrous, and all for no good reason.

I hope you are not in that position, but what specifically did you do and what is the equipment involved?I have a video card NVIDIA, 64M, I've tried to use it, but PC do not want. Just because of Flight Simulation. I was thinking if BIOS update would solve this problemYou might want to try the latest drivers. I doubt it has to do with the BIOS.

http://www.nvidia.com/content/drivers/drivers.asp

Be sure to load the right ones for your specific card and operating system.I'll try to install video card following your recomendation and not updating BIOS. As soon as I have results I'll informgood luck. It's a simple procedure, but post back if you get stuck.Unless the BIOS update makes mentioning of newly supported videocards, which I doubt, it might do more harm than good if you do not pay careful attention.Definetively I did not update bios. Not only in this forum, but some friends of mine have told me to forget bios for now. I have installed NVidia, with no results. PC get blocked. Maybe IRQ be the responsible. My MB has a 8M video card, AGP slot, by SIS. This works fine.  I'll install flight simulator in another PC...See if there's a Flight Simulator patch available.You may need to disable your onboard video in the BIOS if you are installing a separate video card. Some motherboards do this automatically when a card is inserted, some do not.