1, discharge method
Discharge modes are divided into jumper discharge mode and COMS battery discharge mode:
Jumper discharge method: disassemble the chassis and find the coms jumper on the motherboard (refer to the motherboard manual). The jumper has three pins, and the motherboard is usually inserted on the 1-2 pin during normal operation. Just plug the jumper on pins 2-3 for a few seconds, then plug it back in to release coms and clear the BIOS password.
COMS battery discharge method: Disassemble the main chassis, and you can see a button-shaped COMS battery on the motherboard. Remove the battery and put it back in a few minutes to clear the BIOS password.
2. Use the master password
General motherboard manufacturers will set a master password when producing motherboards (usually printed on the motherboard manual). Below I list some commonly used BIOS passwords:
Manufacturer's password
Award award, 589589, SER, lkwpeter, clumsiness, AWARD_SW,
J322, tian hu, LKWPETER, j262, BIOSTAR, aLLy,
Syxz、j256、ALFAROME、HLT
Amiami
Note: passwords are strictly case-sensitive, and not all motherboards have master passwords. So, if the master password is invalid, we can only think of other ways!
Step 3 Use debug.exe
Enter dos, enter Debug enter and use the following crack command:
-o 70 16
-o 7 1 16
ask
-o 70 1 1
-o 7 1 ff
ask
After completing the above command, exit DOS, press DEl on the keyboard to enter BIOS after restarting, and the password will be cleared!
By the way, the numbers 70 and 7 1 used in the command are briefly mentioned. The data access of COMS is realized through two I/O ports 70 and 7 1. Port 70H is a byte address port, which is used to set the address of data in COMS. Port 7 1H is used to read and write the contents of the data unit in the COMS address set by port 70H.
4. Write QBasic program.
Write the following program:
Go out & h70 and. H2F
d = INP(& amp； H7 1)+ 1
Go out&H71,d
end
Run this program to clear the BIOS password!
After completing the above command, exit DOS, press DEl on the keyboard to enter BIOS after restarting, and the password will be cleared!