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Saturday, 13. February 2016

BIOS Boot-USB-Stick

Howto: BIOS-Update per bootable USB-Stick

BIOS Update per bootable USB-Stick / Pendrive



A guidance how to create a bootable USB-Stick / Pendrive (incl. MS-DOS system files) to perform a BIOS update.

see also: BIOS-Update Howto: step-by-step instruction
see also: BIOS Update per bootable CD
see also: BIOS Update per DOS-Boot-Diskette



  • The Laptop-/Mainboard-BIOS must support bootable USB-Sticks - which should apply to most of all modells which are not older than 4-5 years. If an USB-Stick was recognized during the boot process, the BIOS will integrate it as a removable drive, or as a normal drive.


The following tools are needed:

  • Ultimate BIOS-Boot-Edition:
    - usbdos (folder contains the 3 hidden! MS-DOS system files, io.sys and msdos.sys)
    - HP_USB_Disk_Storage_Format_Tool v2.2.3.exe (Hewlett-Packard's Format-Utility for USB-Sticks)
    download [1] Ultimate BIOS-Boot-Edition - 5.9MB
  • Flashtool - an executable program (.EXE as file extension), which programs the BIOS file onto the BIOS-Chip, and the BIOS file must be downloaded:
    - Mainboard, bought in its original box: from the mainboard manufacturer website, or
    - Notebook or brand PC: from the notebook/brand PC manufacturer website.
    Both files must be specially designed for the DOS Operation system! If the manufacturer offers only files for Windows, you have to risk the BIOS update either directly under Windows, or you can re-program your old BIOS-Chip, or purchase a new, programmed BIOS-Chip.


New BIOS-Chips (incl. programming) --> in my Shop


Instruction to create a bootable USB-Stick

  • Open the Ultimate BIOS-Boot-Edition and the folder boot_usb_stick.
  • Copy the folder usbdos to your hard disk.
  • Start the HP USB Disk Storage Format Tool.
  • Select your USB-Stick under Device.
  • Choose FAT-32 under File system and activate the check mark Create a DOS startup disk.
  • Insert the path to your usbdos folder under using DOS system files located at:.
  • Press the Start button and wait until the tool has formatted the USB-Stick and has copied the 3 system files.
  • Rename the filename of your flashtool and the BIOS file, if they have more than 8 characters (not the file extension!).
  • Copy your flashtool and the BIOS file onto the USB-Stick.
The DOS system files are normally invisible, because their file attribute is set to hidden. If you would like to show these hidden files, you have to enable the option: "Windows-Explorer / Tools / Folder options / View / Show hidden files and folders" and to disable the option "Hide protected operating system files".


Starting the BIOS-Update from USB-Stick

  • First, go into your BIOS-Setup and change the Bootsequence to USB-Stick/Drive (search for an option like Bootsequence, First Boot Device, or something similarly).

  • Insert the USB-Stick and restart your PC. If all went well - MS-DOS starts and you can see the famous DOS-Prompt (C:\>).

  • Now you can start the BIOS update. Remember: it's a good idea to backup the old BIOS version.

  • See also: BIOS-Update Howto: step-by-step instruction

Happy flashing!


User-Comments: BIOS Boot-USB-Stick

Because the mainboard manufacturer provides these files in a special version for your mainboard model, and i'm no wizard.

biosflash 1.Dec.2015 06:33

Why didn't you just provide a flash tool?

zack 1.Dec.2015 01:57

Use another USB or PS/2 keyboard, or another USB 2.0 (not 3.0!) port.

biosflash 20.Nov.2015 19:34

hi guys . I did everything but have a big problem right now. . it says go to bios and choose usb for boot. but I can not open bios. and my keyboard is usb and it does not work.. ?

sslinux 20.Nov.2015 17:08

No, this should not work. Maybe a CD-ROM.

biosflash 28.Sep.2015 06:05

thanks info sir.. but ihave a question,when i turn on my pc i have blank screen,but my motherboard havent floppy slot..can i instal bios with usb when blank screen? then usb can work like Diskette sir?

duwek 28.Sep.2015 03:46

i have a toshiba s855 laptop that has had a bad bios flash,it has insyde bios,is their a way to fix without a new bios in the usa so having you to repair would be expensive

joe 8.Sep.2015 19:11

Very usefull site

Srdjan 23.Aug.2015 01:05

Hört sich nach defekter GraKa an. Ich würde den Herstellersupport kontakten.

biosflash 26.Apr.2015 16:21

Seit 3Tagen sind auf meinen HP-Pavillion dv9061ea Entertaiment Streifen und Punkte zu sehen,die ich mit neuen grafiktreiber nich erledigen konnte. Was soll ich machen?

jonny.1 26.Apr.2015 16:14
 (3 chars)


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