Update: I've left out the battery for a whole weekend. Still the BIOS settings are not cleared. Still they are stuck. I have no other explanation for that other than that this board must be storing its settings in flash memory rather than nvram.
I did manage to get my system booting again. I could undo the changes made by efibootmgr by booting from the SystemRescueCD on USB stick. I can now again boot my Linux installation on my harddrive by booting from an UEFI USB stick using grub.efi.
But I'm still locked out of booting from harddisk directly, and from booting from CD.
So, is there any other option to get control over the BIOS back, other than returning this board for warranty?
Since I can only boot from USB in my current settings, I tried to use iflash2.exe from a DOS bootable USB stick. iflash2.exe has a /f option to reset the BIOS settings to default. Unfortunately, it will only do that if there is also a BIOS upgrade to be performed. Since there is no newer version, I tried flashing the same BIOS. But iflash2 refuses that.
So I downgraded it to 0724. The downgrade was completed successfully, but the board is dead now.
The board responds to the on/off switch, and lights flicker, but there is no video and no signs of boot progress.
The LED stays at 00.
Pressing the BIOS Back button or setting the recovery jumper do not change anything.
I will have to return this board ...
we always update the bios with the .BIO file on usb stick and option F7 enabled in BIOS.
you cannot clear the bios completely with putting the battery out.
there keep still settings stored on the board in a eprom.
just saw this thread. The same here:
[url=http://communities.intel.com/message/157656?tstart=0#157656]DN2800MT can't modify any BIOS setting anymore[/url]
even the simplest things (to erase everything in BIOS to some working default) does not work safely on todays computer hardware.
Instead developers focus on Graphical BIOS User Interfaces and other unnecessary crap^^
same drama here, of course after buying alle the stuff, including a 120Gig SSD for this crappy board.
After many many attempts and reboots and pushing the F2 button I managed to get in the BIOS but the BIOS forgets every change!!!!
I even flashed the bios on the "BIO-way" and restored and saved the new bios.
Result: windows crashes and tries to resore the computer to the previous working session......
A whole day burned because of this crappy atom board!!!!
My advise to Intel: go back to "Asus-school" and only do what you do best: making normal non-atom cpu's!!
I have the exact same issue on a DN2800MT board. Unable to change any values in the bios except the date and the time. The error exists in the latest bios (159) also. I've tried to disconnect the battery for about 3 hours but the settings remained, and still can't change any value. Does anybody have any solution?
Intel!!!? Do you have any comment on this?
Thanks for your help, but id didn't solved the problem. I've followed your instruction and the bios is still read only. Any other advice besides that, to return the board?
Sorry, left out the F9 step:
Power down and unplug the power supply.
Move it from 1-2 to 2-3.
Setup runs automatically.
Press F9 to reset.
Press F10 to save and exit.
Move it back to 1-2.
I've followed your instructions. After pressing the F9 the BIOS loaded the default values. But after pressing the F10 and Y powered off disconnected from the power supply and restored the jumper to 1-2 and powered on the BIOS still shows the previous values not the default values. It seems the BIOS can't save the changed data.
Hmm.. You should probably open your own thread, I was originally replying to the OP. But it would be rude to continue to figure out your problem here.