I fixed the fan message by flashing backwards, 1 update at a time from 2111 to 1815.
I was getting the double post issue with 2111 - this BIOS 1815 is very fast on BOOT especially with the hyperboot enabled and the screen set to TXT not graphic.
If you want to follow what I have done for any reason.
You need a separate computer really and a USB flash drive.
Download the recovery bio files for each BIOS and place n -1 on the flash drive.
Remove the motherboard BIOS recovery jumper and reboot.
Wait... wait some more. The PC will auto-restart if it didn't like something - like going back two BIOS releases by accident.
Once the flash drive indicator light stops flashing, you should see the BIOS screen shortly thereafter and then a progress update with the BIOS flash progress.
It will ask for a reboot.
At this point I did not reboot.
I simply removed the flash drive - removed n and applied n-1 recovery BIOS file - and then re-insterted the drive and only then rebooted.
It immidiately went into BIOS recovery mode again - perfect.
This cut the entire time down to 30 mins or so.
But it took me a long time with trial and error to figure out what was going on, what works and what does not.
The Windows autoupdater files definately do not flash backwards as far as I can tell - but I did sometimes try more than one release step backwards.
The lack of a fan with a BIOS greater than 1815 seems to cause weired problems when the system is setting itself into recovery mode.
I had to re-attach a fan to the CPU fan socket - and hang it outside the case.
I have not solved the MARVELL issue - any one else got this eSATA port working?