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Wednesday, 27. May 2015

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

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

You should contact the Hasee support.

biosflash 22.Dec.2014 15:01

Hello sir, I am using hasee hec41 bios is corrupted while i tried to update it(black screen) there is no bios file in official site.My bios version:2.10.1208,AMI Bios,ver:E460YD09. Can u help me with instructions and tools(including bios file).please not that i dont have a cd drive. Can i do this with pendrive? Thanks in advance.

Ramakrishnan 22.Dec.2014 14:35

@Kaspar You sure its on e? Try typing "dir" without the quotes and then press enter. If you see the name of your flash file, type is exactly "5842a10.exe" for example and press enter. If you type dir and you don't see your files, try just typing "e:" or "cd e:\" you can type "cd " to go inside a folder.

veraVita 12.Sep.2014 12:16

Insert "E:" (without quotes!) on the command line to change to drive E:

biosflash 3.Sep.2014 17:00

Thank you for the link, but It did not solv the problem. My bios update is on the USB stick with drive letter E:, do I have to typ this in the command line? If so, what is the command for that. what should I write after the C:> to change to letter E. Everything i write after the C.. I get the line saying: invaled command . Thanks for your help.

Kaspar 3.Sep.2014 16:33


biosflash 3.Sep.2014 06:09

I have the famous C:\> command. My thumbdrive has the letter E. What should I do. What should my command line be. tanks

Kaspar 2.Sep.2014 22:49

Hello to you all. The BIOS of my Toshiba Satellite P200 does not have the USB disk or stick Boot option, but it has floppy boot possibility by an USB external floppy drive. How to make an USB stick to look like the floppy drive and having at the same time a live linux OS on that stick. Thanks.

Jo Bernard 2.Jul.2014 23:35
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