Hi friends.
x401u-m3 rev.2.0 automatically goes to bios screen and not boot from h.d.d.I mean after the system reset it goes to bios screen
an do not boot from any device.So i updated bios links below:
viewtopic.php?f=40&t=3878&p=140015&hilit=%2Ax401u%2A#p140015
this file: good_x501uas313_mainboard-x401u-m3_rev.2.0
Now system boots up from H.D.D and works well but there is an issue,the keyboard do not works properly,and the all key has wrong function,as the example the "B" works as down arrow key,i tried some bios but the same.
َinclusively the keyboard works well with my backed up bios....
Any help please.

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[size=85][color=#DA573B]Posted after 3 minutes 12 seconds:[/color][/size]
I must add this that the bios files on asus support site are not true ones.i compared them with backed bios.

Asus has Easy Flash.

Flash yours backup. Write update file from ASUS support to USB FLASH DRIVE. Go to bios, select Start Easy Flash and update.

Hello! You need to go into the BIOS (actually (U)EFI Settings) and enable Legacy (BIOS) Mode or the UEFI Compatibility Support Module (CSM) or similarly worded option.

Hi thanks for care.
I flashed my backup file but i could not flash the new bios because the system says "Build date is too old".
I downloaded the latest update version 313 from asus site.And the current version is 313 too.
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Dear Dejmos,the bios has only this option"launch efi shell from filesystem device".when i choose this option.system reply with"not found" error.
Thanks again..

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[size=85][color=#DA573B]Posted after 41 minute 18 seconds:[/color][/size]
I flashed bios with above link again:
viewtopic.php?f=40&t=3878&p=140015&hilit=%2Ax401u%2A#p140015
this file: good_x501uas313_mainboard-x401u-m3_rev.2.0
And with external keyboard i tryed to flash new updated file with easy flash again,this time it has "No model name structure found"error.
I think the asus bios files(4MB) for this laptop is wrong.!!!!!?
Asus x401u bios link:
"http://support.asus.com/download.aspx?SLanguage=en&p=3&s=415&m=X401U&os=&hashedid=gt7tGwyBZJKmXv4z"

Check mail.

i had exact problem as you have! And i have the solution! You need change settings, after you'll have success with bios flashing(you need that version of bios, when will be that function, or you need installatiion media with UEFI)!
Windows 8 uses uefi partition to boot, and if bios support this, it is more secure and speed up boot time, but if your uefi partition has been lost or broken, your PC goest to setup screen, because new asus models does not display this message: "insert boot media in selected boot device and press a key" . If you change bios settings to legasy it will looking for any boot sector on all devices present as bootable in bios settings.
Did you have that settings in bios?:

You need Enable CSM

Hi,i flashed new bios problem approximately solved but some keys have issues and work instead of another.The keys have this problem are these:m-0-u-i-o-p-L-k-j that type 0-/-4-5-6-*-3-2-1.
thanks for support.

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[size=85][color=#DA573B]Posted after 47 minutes 14 seconds:[/color][/size]
Dear Dejmos i have that setting and i tried enabling launch csm but there is no change,and after save an exit,system goes to bios again and launch csm disabled again..and i can boot to windows with another bioses but with only keyboard errors.

you mean, that you try to enable CSM, and after restart this feture still disabled?
Procedure is very simple - enabling CSM > restrat > system goes to Setup(chose boot device, then save and exit), or you can call boot menu by pressing ESC key during post.
Try to restore original bios, from ASUS Support site..

Yes,you right.
There is no boot device with this bios.

that bios which I had sent - from ASUS and work 100%
so, or your model is not x401u or keyboard is broken.

Hi,you right,everything is ok,but keyboard has issue with some keys,and now i know something has fallen on keyboard.
Thanks for support.topic closed.