If you can boot from CD/USB

When Windows doesn’t boot properly và you cannot get into lớn the BIOS khổng lồ change the boot order, you could be lucky enough that booting lớn CD or USB might already be set at a higher priority than booting to Windows & simply inserting a CD or flash drive will boot khổng lồ it automatically. It’s also possible that CD or USB booting could be just below hard drives in the order, in which case you would need to lớn temporarily disconnect the hard drive(s).

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If you can still access Windows, another solution to enable CD/USB booting is using a great tool called Plop Boot Manager. What it does is allow booting from these devices even if the system BIOS doesn’t support the function or the boot order is not accessible. Even if you don’t want it for this purpose, Plop is a great tool to know about for using on older computers.

Here are some tools which can be used by booting from the relevant CD or USB flash drive. Simply burn the downloaded ISO tệp tin khổng lồ a disc or use one of these ISO to USB tools.

PC CMOS Cleaner


PC CMOS Cleaner is able to lớn recover, remove sầu, decode và display the user or supervisor password stored in the BIOS irrespective of the machine br&. Award, American Megatrends (AMI), Compaq, Phoenix, Samsung, IBM, Compaq, DTK, Thinkpad, Sony, Toshitía are all in the danh mục of supported BIOSes so there’s a good chance your BIOS is included. PC CMOS Cleaner is a bootable Linux CD so you don’t have to worry about operating system compatibility. On launch the program will first try khổng lồ decrypt & display a danh mục of possible passwords. Failing that, you can choose khổng lồ remove the password using two options, the second of which will completely reset the BIOS to defaults so you’ll have to go và reconfigure it afterwards.

Download PC CMOS Cleaner

CmosPwd by CGSecurity


This is one of the more up khổng lồ date và popular CMOS decryption tools although it’s still quite old dating bachồng khổng lồ 2007. CmosPwd decrypts the password stored in the CMOS & displays it. The following BIOSes are supported:

ACER/IBM BIOSAXiaoMI BIOSAMI WinBIOS 2.5Award 4.5x/4.6x/6.0Compaq (1992)Compaq (New version)IBM (PS/2, Activa, Thinkpad)Packard BellPhoenix 1.00.09.AC0 (1994), a486 1.03, 1.04, 1.10 A03, 4.05 rev 1.02.943, 4.06 rev 1.13.1107Phoenix 4 release 6 (User)Gateway Solo – Phoenix 4.0 release 6ToshibaZenith AMI

With CmosPwd, you can also backup, restore, erase or even kill the CMOS. CmosPwd is included in the Hirens Boot CD DOS programs menu. Select “9. Next” -> “2. BIOS/CMOS Tools” -> “2. BIOS Cracker 5.0 (cmospwd)”. There’s also a version you can run from within Windows which is available on the CGSecurity trang web along with some useful information.

!Bquả táo by eleventh alliance


!Bgame ios is a tool that was developed for a brute force attack on BIOS passwords. You can also backup and restore the BIOS và there’s even a Blaster option where can blank certain parts of the BIOS in the hope of removing the password, a powerful & potentially dangerous option because it could completely corrupt the BIOS. !Bgame ios can try and craông xã the passwords used in some common BIOSes including various versions by IBM, American Megatrends (AMI), Award & also Phoenix. It’s a very old tool dating back khổng lồ the late 90’s so is unlikely khổng lồ work effectively on more recent computers.

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Like CmosPwd, !Btiện ích ios is also included in the Dos Programs thực đơn of Hirens Boot CD. Select “9. Next” -> “2. BIOS/CMOS Tools” -> “4. !BIOS 3.đôi mươi (ibios)”. You can also tải về a separate !Bgame ios Windows tool.

Invalidating the CMOS Checksum Manually

If you prefer khổng lồ vì chưng it manually rather than relying on automated programs or the other tools lượt thích CMOS De-Animator aren’t working, it is possible to lớn reset the BIOS password by using the debug.exe tool which will invalidate the CMOS checksum in a similar way to lớn CMOS De-Animator. This can be achieved by typing two commands into the debug tool if you first boot up the computer in FreeDOS. Here are the instructions.

1. Install FreeDOS on a USB flash drive sầu using Rufus or UNetbootin.

2. Download the debug.exe cộ tool & save it khổng lồ the root of your USB flash drive sầu.

3. Boot up the computer with your USB flash drive sầu và type the following commands: (take note that the second và third commands start with the letter O and not the number zero.)

debugo 70 2Eo 71 FFquit


4. Restart your computer with Ctrl + Alt + Del & you should encounter an error message lượt thích “CMOS checksum error” which is normal. You can now access the CMOS thiết lập without entering a password.