I'm about to update my bios but have two files showing in the usb when i perform the EZ Flash 2 update with a USB stick.

 

the files are Data.BIN and data5M.BIN

 

what one will i select guys? anyone have any experience on this?

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Neither, the BIOS should end with .CAP and Asus now states that you should update the BIOS with their BIOS Updater tool and not update through the UEFI or EZ Flash 2.

 

I do not know where you got this BIOS from, but the latest on the Asus website for the Z87-A is 2103 and the BIOS file name is Z87-A-ASUS-2103.CAP

 

You can download the BIOS updater and the 2103 BIOS at

http://www.service.asus.com/#!downloads/c1wax

 

After you download and unzip it go to the V2.00.02 and double click on the Update.exe file, select your BIOS and follow directions.  When it reboots you need to leave it alone and let if finish.  It may seem like it is taking awhile, but just wait until it is done!!!!!!!  It may reboot more than once before it is done.

 

After it is finished updating all UEFI settings will be at default.  After you update it you will have to get into the UEFI and put any OC settings and any other settings that you may have changed back in along with setting up which SSD/HD is your first boot priority ect.

 

Beware that updating your BIOS may cause your OC to become unstable.  If it does you will have to verify the stability of your OC and change settings as necessary to get it stable again.

Hi, i have found the file .CAP i only moved the updater folder. Done the update last night and everything is working fine, i carried it out by using the EZ flash 2.

 

Haven't set my OC settings but just using the asus optimal.

You mentioned SSD/HD which i have, what settings do you mean for these?

In UEFI you set your OS drive to first boot priority so it looks to boot off that first rather than looking at your DVD or a USB first.

Do you have the asus z87a aswell? and could you send some pics just not sure what i'm doing with that thankyou

I have an Asus Sabertooth Z87, the UEFI should look close to the same.

 

This picture shows boot option 1 and 2.  In this picture boot option 1 is my Samsung 840 Pro on Intel SATA port 2, this is my OS SSD.  Boot option 2 on Intel SATA port 1 is my DVD drive. 

http://i344.photobucket.com/albums/p339/idahosurge/40-BOOT-1B_zpse161736c.png

 

 

This picture shows the other boot options and how I have them setup.

http://i344.photobucket.com/albums/p339/idahosurge/39-BOOT-1A_zpscc396681.png

Ok i set that up per your pictures