Coms brute force cracking

Source: http://www.top777.com/

1. Tool Cracking Method
 
Debug Method

Use debug (a program that comes with dos) to send a data to the port H and H, which can be cleared. The specific operations are as follows:

C:> debug
-O 70 10
-O 71 01
-Q

You can use debug to write a program in a file (such as delcmos.com). The specific operations are as follows:
 
C:> debug
-A 100
Xxxx: 0100 mov dx, 70
Xxxx: 0103 mov al, 10
Xxxxxx: 0105 out dx, al
Xxxx: 0106 mov dx, 71
Xxxx: 0109 mov al, 01
Xxxx: 010b out dx, al
Xxxx: 010c
-R cx
Cx 1, 0000
: 0c
-N delcmos.com
-W
Writing 000c bytes
-Q
After that, run delcmos.com to clear the password settings.

2. Invincible copy method:

In the dos state, type the following command:

C:> copy con cmos.com (and then enter the editing status)

Press and hold the alt key in one hand, and the other hands press the following numeric string on the keypad, and then raise both hands at the same time, so repeatedly:
179,55, 136,216,230,112,176, 32,230,113,254,195,128,251, 64,117,241,195

After completing the preceding steps, press ctrl + z to get a program. (Note: The preceding numbers must be completed in full and cannot be omitted. Otherwise, the compiled program may fail and cause other problems. In addition, you can use type coms.com to view its content. In the future, you only need to run the program cmos.com to unlock the coms password. Start from new, press the del key to enter directly, and then you can set the cmos from the new.

It is worth noting that the above method only applies to those who cannot enter the bios setup program, but can enter the system password settings, and if the system password is set, the system cannot access, the following method is required:

3. The "omnipotent" password method some bios can use the "omnipotent" password. If the bios supports it, this method can work:

(1) ami bios "omnipotent" password:
Can you try the following words: ami, bios, password, hewitt rand, ami? Sw, ami_sw, lkwpeter, a. m. I.

(2) award bios "omnipotent" password:
You can try the following words: award_sw, j262, hlt, ser, sky_fox, biostar, alfarome, lkwpeter, j256, award? Sw, lkwppeter, syxz, ally, 589589,589721, awkard (case sensitive ).
　
4. cmos Discharge Method

Open the chassis, find the battery on the motherboard, and disconnect it from the motherboard (that is, remove the battery). At this time, cmos will lose all internal storage information due to power failure. Connect the battery and shut down the chassis to boot. Because cmos is blank, it will no longer require you to enter the password. At this time, enter the bios setup program, select "load bios default" (default value for loading bios) or "load setup default" (default value for loading setup) in the main menu. The former can start the computer in the safest way, the latter enables your computer to achieve high performance.
　
5. Patch Cord short connection method

If the battery is soldered to the motherboard and the above operation cannot be performed, you can use the "Jumper Transient Method" to discharge cmos (this method is recommended for general users). The specific operation is as follows:
There is a jumper switch near the battery (refer to the motherboard manual). Generally, reset cmos, clean cmos, cmos close, or cmos ram reset are appended to the jumper, the jumper switch is generally set to four feet. Some have a jumper on the first and second feet. In this case, unplug the Jumper and discharge the patch on the second and fourth feet. Some have no jumpers on all the feet, in this case, the two-pin charging capacitor can be transient to discharge.
In addition, it should be noted that almost all boards have clear cmos jumpers and related settings, but the vendor should not be different from each other, for example, some cmos clear devices on the motherboard are not long jumpers, but very small solder joints. Generally, we must use tweezers to short circuit them carefully to clear the cmos password!
　

6. Change the hardware configuration method

Shut down the computer, open the chassis, unplug the hard disk or floppy disk data cable from the motherboard, restart the computer, bios self-check error, the system will require you to reset the bios, at this time the coms password has been cleared.
　
7. Manual discharge

For early bios such as type 386 computers, there is no coms discharge jumper on the motherboard, then, you can use a metal wire of the coms chip to move back and forth to the coms chip (the location of the coms chip on the motherboard can be referred to the motherboard Manual), to achieve the effect of discharge to the cmos chip, thus clearing the password. Note: This method is dangerous. It is recommended that you do not use this method to avoid hard damage.

8. Create your own password cracking File

A. after the system self-check is complete, press f8 when preparing to Boot windows, select "safe mode command prompt only" (safe command mode), and enter copy con yk.com at the dos prompt, press enter and enter:
Alt + 179, alt + 55, alt + + 136, alt + 216, alt + 230, alt + 112, alt + 176, alt + 32, alt + 230, alt + 113 alt + 254, alt + 195, alt + 128, alt + 251, alt + 64, alt + 117, alt + 241, alt + 195, and alt + are saved by pressing f6. Note: When you enter the preceding data, press the alt key, and then press the numeric key in the numeric keyboard (the row above the keyboard does not work, after entering a number, release the alt key and press alt to enter the next number ...... During the input process, every time the alt key is released, a messy character will appear on the screen, so we don't have to worry about it.
After saving and exiting, we directly run the yk.com file. There should be no prompts on the screen, and then restart the computer to clear the password in cmos. Of course, other settings in cmos will also be cleared, which requires us to reset.
B. Select the Security Command mode when starting, enter copy con yk.com, and enter:
Alt + 176, alt + 17, alt + 230, p, alt + 176, alt + 20, alt + 230, q, alt + 205, space, and press f6 to save and run this file, restart the computer.

9. Use tool software

On the Internet, you will find that software that can crack the cmos password is everywhere. I think biospwds is the best software. It is a small software made by Germans, you only need to click the "get passwords" button to display your cmos password on the screen. In addition, you can see the bios version, time, and other information.