Posted 18 December 2010 - 07:18 PM
I am glad you asked.
As you research computer related problems on the web, one of the most common questions you'll see in motherboard related support columns is how do I recover from a "Bad BIOS flash?"
I have assisted many people here in the BC hardware forums with this issue.
In most cases, I have to refer the person to a web site that sells BIOS chips, this of course depends on if the motherboard's BIOS chip is installed in an IC socket, which makes it easier to replace.
Chips that are soldered into the motherboard are harder to replace, because special soldering skills are needed to replace the chip.
The whole problem with the flash procedure is if for any reason power is interrupted to the motherboard, or if the video was to konk out leaving you blind as to what is happening on the screen, of if someone panics and hits the reset button before the flash utility finishes writing a new boot block and requests a restart, the block becomes half written to and is thus what we call corrupted.
Some motherboard makers have implemented what is known as a FAIL-SAFE BIOS update program, which is ran while you are actually booted into the windows operating system.
It does not Flash every memory address built into the CMOS chip also called an EEPROM chip.
There is a recoverable area which is inaccessible to the flash program, to which, the computer's CMOS chip can recover from a bad BIOS flash automatically if the POST fails its self-test do to a corrupted BIOS.
If this is recognized by the CMOS, it reverts back to its original BIOS which is written in a non-volatile area of the ROM (Read Only Memory) chip.
I hope you didn't mind me ranting here, I figured you should know a little bit about the process and what dangers are involved. But also that some motherboard manufactures do add some safe form of doing this.
But not all do, so be careful if you do try to flash a BIOS chip.
I have had one bad BIOS flash in my history, but I had enough electronics back-ground to replace the CMOS chip.
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