I recently had the same problem. I used the opensource tool from "http://unetbootin.sourceforge.net/" to made a bootable USB stick with a DOS in a single step.
-You need a stick with FAT32
-Get the unetbootin tool, choose "distribution" and "Freedos", then let it run.
-Copy via Explorer the iflash2 files and the .bio file on the stick
-Boot from the stick, choose "Boot with no himem. and emm386 or so - second option in the Freedos boot menu IIRR.
-Type C:<space><return>, the space seems to be important. Now you should be in the sticks root directory. dir<return> shows the contents.
-iflash2 /p file.bio for flashing.
Maybe this helps,
That is what I have stated in general. To be specific, at the prompt, type: iflash2 /pf (space) filename.bio, then press enter. Follow the onscreen instruction.
BTW: The original title of this thread is How to update to Bios 5531?. It is change to How to update to Bios 5531?Making bootable stick. The change starts with 4711/Skip's thread.
Thanks for the suggestions Boyet and 4711.
I have tried the F7 method to install from the BIO on a USB stick, all that happens is the PC reboots and no BIOS flash happens. It seems quite involved to make a bootable USB stick, sorry if this sounds a silly question but do you think this will work better than the F7 method to use a BIO file? I am puzzled why the standard Intel methods are failing. What could be causing the issue e.g. is it a bad BIOS that I should not try to force on or is it just the installer is failing?
Saw the update that BIOS 5531 appears to have disappeared from the download list for DP55KG.
I did not attempt to update to 5531 after three different methods failed I decided the risk was too high to try and force an update. The release notes for the next release may give a clue if anything was wrong with 5531.