The same exact thing happened to me. I tried to update the BIOS the suggested way (via Windows) and the machine stayed stuck on post code 21 forever with no display. Not knowing what was going on or when it would finish, I shut the system down after many minutes. Then when I booted it, the components kept turning on and off in a one second rhythm (fans, HDs, DVD, etc). It never really booted. I moved the jumper to pin 2 and 3 and got the same behavior. I then took the jumper off and the system turns on and stays on but always displays a code of 20 with the memory diagnostic LED flashing fast. Nothing is displayed from my video card or the built-in HDMI port. I have a i7 - 3770 as well.
I would greatly appreciate any help with this issue as well.
I reply here to have the same issue even my board is DH77EB and processor is i7-3770S. BIOS version is 0053.
Symptons are exactly the same.
I have tried to initialize BIOS Recovery with three different USB sticks with FAT/FAT32/NTFS as non-bootable and bootable (WinXP, MSDOS, Linux). I have also tried all USB ports at the target system. As well tried CD-R and CD-RW, bootable and non-bootable. Nothing happens during the BIOS Recovery power on.
Some Intel technician really should take a look at this problem and give a response and instructions how to get motherboards back to live.
Alessandro,
I did update via Windows too, but that BIOS update was initialized successfully.
However, by my own mistake I interrupted it by accident causing BIOS corruption.
That was totally on me, but non-working Recovery BIOS Update is on Intel.
I have no idea what to try next.
Hi
Have you tried the recovery instructions at:
http://www.intel.com/support/motherboards/desktop/sb/cs-023360.htm
Regards
Phil
Hi Phil,
I think we all tried the recovery instructions. That's what we wrote...
Hi
I've not seen anyone say they've tried the full recovery method with the BIO file on the root of a USB stick, plugged into a USB 2 port, with the jumper removed then powering up. That is the full recovery method when the BIOS update has been interrupted. If you have then I apologise, but thought it worth pointing out the article.
Regards
Phil
Phil,
yes, I also have tried the full recovery method. Is there some other recovery method to try?
Actually there are several different instructions at Intel.com, some saying stick/CD
needs to be bootable, some saying that is not needed. That's why I have tried them all.
Maybe the best up-to-date document should be the Technical Product Specification at
http://downloadmirror.intel.com/20951/eng/dh77eb_TechProdSpec01.pdf
which chapter 3.7 says USB stick/CD media does not need to be bootable.
Recovery BIOS Update just not start.
Hi All,
Please try this link below
Desktop Boards: Instructions for Recovery BIOS update
Do not forget to open the chassis and remove the BIOS Configuration Jumper. See below;
Thanks,
Murat,
your link is the same as Phil earlier showed.
Obviously we have removed the jumper, because that is the only way to go for Recovery update 
Hi
Did you use a FAT32 formatted USB stick with the BIOS file the only file on there? Absolutely correct, no need for it to be bootable.
I suspect you have done everything to the letter it is just broken, hopefully Intel will get this sorted out.
Regards
Phil
Guys, guess what! I got my DH77EB BIOS recovered! Unbelievable.
I live chatted with Intel technical support person and he told me one essential
matter which is not mentioned at recovery instructions. There must be
nothing else but one *.BIO file at USB stick / CD and also he confirmed
that media does not need to be bootable (like Phil also said here).
I had tried that setup also earlier, but now I got confirmation that I can
continue trying without any kinds of bootable media attempts.
So, with fresh enthusiasm, I started to try again in several ways
- CD-R with only EB0071.BIO in it (this is the BIOS file for my board)
- LG BR-ROM/DVD-RW drive at SATA
- burnt with Nero
- burnt with Win 7 internal burner
- burnt with CDburnerXP
--> recovery did not start
- same things with CD-RW disc with only EB0071.BIO in it
--> recovery did not start
1GB Kingston USB stick with FAT, only EB0071.BIO in it
- tried several USB 2.0 and USB 3.0 ports
--> recovery did not start
16GB Kingston USB stick with FAT32, only EB0071.BIO in it
- tried several USB 2.0 and USB 3.0 ports
--> recovery did not start
I was pretty much ready to say it's not working. Then I just tried once more
and now I disconnected all other USB devices (i.e. mouse and keyboard)
and removed CMOS battery for a half an hour. I put 16GB FAT32 stick
in front panel USB 3.0 port and turned AC power on and RECOVERY STARTED.
Victory dance!
Not sure if it was CMOS battery, or no-other-usb-devices, or the front panel port.
Or all together. I was trying all of those earlier except no-other-usb-devices.
When I tried earlier to remove CMOS battery my USB stick was bootable
(i.e. having other files also).
I'm happy not to stop trying even it really seemed pointless. Intel instructions
could be better to mention "only this file" requirement, as well as CMOS battery
removal, if that is needed.
Good luck you guys. Really hope you could try my way and it works for you also!
No victory dance for me.
I did what jannek did
I took out the cmos battery for an hour.
formated a fresh 8gb usb stick fat32
copied BH0070.BIO to the stick.
removed the jumper to be in bios recovey mode,
unplugged my KB and mouse
plugged the stick into a usb3 port then turned on the power
now I have the turn on/off syndrome. will not stay powered on.
What causes this power on power off cycling every few seconds?
Anyone else have any ideas?
I am so mad because my system was sworking great until I did the bios upgrade.
Steven
Hi
You need to use a USB2 port, not USB3 for flash recovery.
Regards
Phil
