How To Boot Asus From USB Using BIOS

3 Ways To Boot An Asus From USB Or CD [SOLVED]

If you need to boot your Asus computer from USB drive or CD-ROM, you have to get into BIOS to create the configuration.

Over in the Super User forums, a poster with a Zenbook said that after consulting with an Asus tech, he was told that with Windows 8 you can not boot from BIOS.

We published a pair of workarounds for this issue down the page if you want to try it- they’re listed under Asus Windows 8 Workaround.

How To Boot From USB Using BIOS

If you’re looking to do the boot from a flash drive or CD on Windows 10, Asus provides the following instructions.

(If you don’t know how to enter BIOS, scroll down a bit- we’ve outlined a process for doing so).

Asus X555L Bios Boot from Usb Disk Drive

  1. When you go into the BIOS configuration, make sure you choose [BOOT].
  2. Next, you’ll enable [Launch CSM]. (Compatibility Support Module)
  3. Enter [Security] -> and then you’ll disable [Secure Boot Control]
  4. Press F10 in order to save the configuration changes.
  5. You are able to boot the computer from USB drive/CD-ROM by using the 2 approaches below.

Approach #1: Enter BIOS -> Choose [Save & Exit] -> Choose USB drive/CD-ROM from [Boot Override]

Approach #2: Hold and press [ESC] and after that push the power button to activate the system. You can choose the boot device from the list.

ASUS How To Boot From a USB Device (Flash Drive or Other USB)

How To Enter Bios

According to Asus, because of the Fast Startup feature, you can’t just press F2 to get in BIOS configuration when booting the computer.

Check out the steps below to enter BIOS configuration.

1. Hold and press [Shift] after that switch off the computer.

2. Push and hold the F2 button after that click on the power button. Don’t let go of the F2 button prior to the BIOS screen displaying.

3. You’ll then be able to access BIOS configuration.

Asus Windows 8 Workarounds

The Asus Windows 8 workaround, if the boot from USB option isn’t available from BIOS, is listed below. (You can see the original instructions here).

  1. Plug in the USB drive
  2. Switch the Zenbook laptop on
  3. Enter UEFI (BIOS) by means of pressing ESC or F2
  4. In ‘Boot’ tab: ‘Disable Fastboot’ (*)
  5. Press F10 in order to save & quit
  6. Right away press ESC or F2 once again
  7. In ‘Boot’ tab: your USB drive ought to be listed – change the order
  8. Hit F10 in order to save & quit
  9. Your Zenbook ought to now boot from your USB drive

*You should ‘Enable CSM’ if you wish to boot in legacy mode.

If the above doesn’t work, the poster says that you may need a more modern firmware version.

Another Super User poster provided an additional fix that solved the problem for a bunch of Asus users:

  1. Power your computer on
  2. Press F2 to enter into BIOS
  3. Press Tab to Boot
  4. Make sure “Secure Boot” is Disabled
  5. “CSM + UEFI” selected in OS Mode Selection
  6. Then press F10
  7. Hold down F2 to enter into BIOS
  8. Check boot -> Boot Priority to determine if connected USB shows up

USB Flash Drive Boot References

Instructables assembled a helpful tabulation of USB Flash Drive Boot References.

Check it out or below- and refer to their site for other brands:

BrandTypeModelsBoot MenuBoot OnceChange PriorityBIOS / UEFI Key
AsuslaptopVivoBook f200ca, f202e, q200e, s200e, s400ca, s500ca, u38n, v500ca, v550ca, v551, x200ca, x202e, x550ca, z202eEscDelete
AsuslaptopN550JV, N750JV, N550LF, Rog g750jh, Rog g750jw, Rog g750jxEscDisable "Fast Boot" and "Secure Boot Control" in order to boot from MBR formatted media.F2
AsuslaptopZenbook Infinity ux301, Infinity ux301la, Prime ux31a, Prime ux32vd, R509C, Taichi 21, Touch u500vz, Transformer Book TX300EscDisable "Fast Boot" and "Secure Boot Control" in order to boot from MBR formatted media.F2
Asusnotebookk25f, k35e, k34u, k35u, k43u, k46cb, k52f, k53e, k55a, k60ij, k70ab, k72f, k73e, k73s, k84l, k93sm, k93sv, k95vb, k501, k601, R503C, x32a, x35u, x54c, x61g, x64c, x64v, x75a, x83v, x83vb, x90, x93sv, x95gl, x101ch, x102ba, x200ca, x202e, x301a, x401a, x401u, x501a, x502c, x750jaF8DEL
AsusnetbookEee PC 1015, 1025cEscBoot Tab, Boot Device Priority, 1st Boot Device, Removable Device, F10F2
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iBoySoft also has some useful information about troubleshooting an unmountable boot volume error.


When you boot your Asus computer from a USB device, what’s actually happening is that you’re running your computer with the operating system that you’ve got installed on the actual flash drive.

That’s compared to how it normally works starting your P.C.- you’re running it with the operating system that’s installed on your internal hard drive. Whether it’s Windows, Linux, or something else.

Generally, it should only take 10-20 minutes to get done- though, as we’ve seen, there are some additional complexities with Windows 8 and Asus machines.

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