The simplest and probably the more reliable is to use F7 flash update.
You have to go to the bios menu and enable display F7 bios update proposal (at the same place as for F2 and F10).
Then you copy the file BL0119P.BIO to an USB key (preferably the root and not to much files on it).
Then you stop and restart the system and press F7 when proposed.
The bios is then updated (after you allow the file choice) with all the steps of the process displaying at the screen (it takes 2 to 3mn).
After a success message the system restarts itself (two times).
I suggest also to go to the bios after that and set the standard default values before setting again your own, because I observed bad values reported by IDU not doing this (at bios 105 to bios 110 upgrade).
I had the same issue updating my DH67GD motherboard with using the boot to USB stick approach with IFLASH2 and BL0160.bio. Indicated it was successful, yet IFLASH2 /i also showed the previous version:
Currently installed BIOSID : BLH6710H.86A.0076.2010.1115.1959. Are you saying that if I enable F7 function, it will work?
With DH67GD I allways used F7 to update bios, up to bios 132 and it's OK.
To reach the bios try first to hit F2 at high rate after power on, or place the bios configuration jumper on the board in the "configuration" position instead of "normal" (have a look at the quick ref. paper in the box).
The boot failing maybe related to bad disk Controler setting.