I have a DH67CL board which I stupidly flashed beyond Sandy Bridge, in other words, I went from to 0132 to 0146 (before it was pulled from intel.com) and then on to 0156 because 0146 was flaky. I want to revert back to 0132 because of a bug which does not appear on a similar PC with 0132. My question is: does executing a Recovery BIOS Update replace the entire contents of BIOS? If true, that would solve the published problem that once a board moves from Sandy Bridge (0132 and below) to Ivy Bridge BIOS, the board is forever doomed to remain on Ivy Bridge. I am comfortable with the use of a portable floppy drive and moving jumpers.
Let me help you with this.
Please note that BIOS updates include many changes and fixes for the computer but there is something called Transition BIOS. This is a BIOS version that will make big changes and will not be possible to roll back to a previous version once that version is installed.
In your case, the BIOS version 0151 is the transition BIOS so I regret to say that you can do a BIOS update or BIOS recovery process but will not be possible to revert to version 0132.
You can check the BIOS release notes here: