Flashing BIOS via software

If you have access to the computer when it's turned on, you could try one of those programs that remove the password from the BIOS, by invalidating its memory. However, it might happen you don't have one of those programs when you have access to the computer, so you'd better learn how to do manually what they do. You can reset the BIOS to its default values using the MS-DOS tool DEBUG (type DEBUG at the command prompt. You'd better do it in pure MS-DOS mode, not from a MS-DOS shell window in Windows). Once you are in the debug environment enter the following commands: AMI/AWARD BIOS O 70 17 O 71 17 Q PHOENIX BIOS O 70 FF O 71 17 Q GENERIC Invalidates CMOS RAM. Should work on all AT motherboards (XT motherboards don't have CMOS) O 70 2E O 71 FF Q Note that the first letter is a "O" not the number "0". The numbers which follow are two bytes in hex format. There are a few different ways to reset the cmos, here's a few:
1. there are many default common passwords, such as: At boot-up note the BIOS provider (Award, AMI, Phoenix, IBM, etc.) For Award BIOS' try these backdoor passwords: AWARD_SW j262 HLT SER SKY_FOX BIOSTAR ALFAROME Lkwpeter j256 AWARD?SW LKWPETER syxz ALLy 589589 589721 awkward CONCAT d8on CONDO j64 szyx For AMI BIOS' try these backdoor passwords: AMI BIOS PASSWORD HEWITT RAND AMI?SW AMI_SW LKWPETER A.M.I. CONDO For PHOENIX BIOS' try this backdoor password: phoenix there are too many to count here's a list http://www.phenoelit.de/dpl/dpl.html (search for PC BIOS) 2. On some older PC's pressing the insert key upon startup will clear the CMOS, make sure you hold it down till it's done booting. 3. Another way which we pretty much already covered, was to pull the metallic nickel looking battery that supplies power to the CMOS. 4. Some times there is a small three pin jumper used to reset the bios, just move the black little pin cover to the opposite two pins. (Make sure to read the motherboards manual before this) 5. If the battery is soldered in you can take a soldering iron to it but I don't recommend it unless you are a professional. 6. there are a few programs out on the net which are made to crack certain types of bios passwords, I have one for award BIOS's here's a couple: http://www.11a.nu/ibios.htm http://natan.zejn.si/rempass.html