I work for Intel Customer Support and we usually do not recommend a BIOS downgrade unless really necessary but you are correct, it is still an option when the newer BIOS doesnt do what you were expecting.
You pretty much tried everything documented here: BIOS Recovery Update Instructions for Intel® NUC only additional recommendation, I would say: try this o a regular monitor and not connected to a TV or very large screen. If you still have problems please contact us via Chat or Phone to check on next steps, here is our contact information Contact Support and make reference to case #02769246.
Thanks for your input.
I am doing this on a Dell U2515H monitor, which has a resolution of 2560 x 1440, connected via HDMI (both on the NUC and the Monitor).
Is that considered a very large screen?
I will try to locate a smaller monitor, to see if this helps.
The Dell U2515H (25 inches) should be an Okay monitor to do so. I was thinking on very large TVs, 40 inches or more that really need to use the Graphics Driver to work properly.
If you could locate another monitor to try that would be great if not please give us a call.
Tried downgrade bios on NUC7i3BNH from 0045/0042 to 0036 and 0031 (BN4026.bio first) but failed both normal upgrade and bios recovery -F4 with BN0036.bio and BN4026.bio files. Are we locked at 0040+ bios' ?
I experience same problem with black screen normal monitor hdmi/hdmi 1920x1080, tried two diff usb (one with fat32 and another ntfs) mem sticks where I had bio file at root and when forced recovery mode F4 it reboots usb mem stick led light turned then flash 2-3 sec and led turned off power button led(blue) remains on for a while and then it reboots nothing altered with bios
I have now tried with another monitor.
A Dell UltraSharp 2009Wt, which has a resolution of 1680 x 1050. Connected with a HDMI-to-DVI cable.
Still the same issue.
Using the Power Button Menu, selecting F4, NUC is rebooting (properly to go into BIOS Recovery mode), but just sits there with no monitor-signal and the Power LED on.
i had the same issue, but found a solution with the poweroff, to be honest too easy to be true, but working,
tried it on 2 NUC7i7BNH. one NUC had BIOS Version 0042, the other 0048.
Shutdown your NUC, open your NUC, remove the BIOS security jumper.
poweron your NUC, select in the Detected BIOS Security Jumper Removed Menu Option 2 for removing passowrds. power off your NUC as requested and then place the jumper in the 1-2 position which is default. power up your NUC and then it was working for me fine.
If you look at the Release Notes for the BIOS update, it says that you can't downgrade to a previous BIOS using the F7 update, iFlash, or Power Button Menu F4 Recovery functions because of an ME and EC firmware update. If you put the previous BIOS BN0036.BIO file on a FAT32 blank flash drive (USB 2.0 or older is best, no other files but the BIO file), then pull the Security Jumper on the board, the system should start a BIOS Recovery flash using the flash drive. If it does not see the drive correctly, it will go straight to the Power Button Menu. Try a different drive. If it does see it, then it will display a message on screen that Recovery will start in 20 seconds.
You should be able to recover to a previous BIOS this way. If it still does not work, then because of the ME FW change you will not be cable to go back to a previous BIOS at all.
Hope this helps.
BIOS 0048 just came out so you might try that to see if it fixes your issues first.
no bios update did help, also not 0048, i did not do any recovery, because this was not working all hints did not help here, tried them
i just did a the stupid description above which solved the power off function on ESXi 6.0 U3
Thanks for your suggestions, unfortunately it did not work for me.
I have done as you described, but my system still won't turn off when "asked" to do a Shutdown.
Looking at the logs of the DCUI in ESXi while doing a shutdown (hitting ALT+F12, after requesting a shutdown), the final message is:
"VMKAcpi: 1498: Bus 01 can't wake system from S5 (max is S4)"
"VMKAcpi: 1498: Bus 02 can't wake system from S5 (max is S4)" (if a USB-C Ethernet adapter is plugged in).
So this issue is as far as I can tell related to USB somehow.
I am booting my NUC7i3BNH from a 8GB Sandisk USB flash drive, which have ESXi installed.
I have tried removing everything else from the system (USB-C Ethernet adapter, USB keyboard, HDMI cable for monitor), but the system still don't want to power off.
I also have a BIOS that needs to be downgraded, although this one has the same ME firmware, yet still doesn't let me downgrade (NUC 7 i5 firmware 050 -> 047).
I was planning to do the jumper method, but then I read this:
BIOS recovery using the BIOS security jumper clears trusted platform module keys, Intel® Platform Trust Technology (Intel® PTT) keys, and High-bandwidth Digital Content Protection (HDCP) keys. These keys will not be restored after the BIOS recovery.
What does that mean?