i need bios rom file for mobo asus model :P8H61-M LX3 R2.0

Google your model number and rom and you come up with this page:
http://www.asus.com/au/Motherboards/P8H61M_LX3_R20/HelpDesk_Download/

Then click what Operating System you have and there is a BIOS section :)

Happy hunting
 
If you can already boot your PC with your current BIOS then the standard way to update is to install the ASUS Update Utility from the Motherboard CD-ROM included with your Motherboard. Insert the CD, and select and install ASUS AI Suite 2.

Once you have installed ASUS AI Suite 2 launch it and select (from the Windows Quick Bar ) the Update button followed by ASUS Update. Select Update BIOS to automatically download the latest BIOS version.

If you can't boot your PC but can access the BIOS :

Follow this link: http://www.asus.com/es/Motherboards/P8H61M_LX_R20/HelpDesk_Download/#P8H61-M-LX-R2-ASUS-0904.zip

I'm sorry the website is in Spanish but for some reason I can't locate an English version. Just select your version of Windows and then click the BIOS button and download the latest version. Copy it to a CD-R or the Root Directory of a USB Thumb Drive and use the Update BIOS option from your Motherboard's BIOS Menu.

Hope that helps.
 
please, never ever use Windows to update BIOS!!!
just in BIOS itself by using the integrated flash tool

Here in english:
http://www.asus.com/Motherboards/P8H61M_LX_R20/HelpDesk_Download/

1204 is the current Version of the board
the link from karl_oh is old