My NUC6i3SYH stopped working on reboot, with no monitor output, no USB Power. Fan running, power LED showing blue, no blink codes. It is out of warranty, about 3 1/2 years old.
After disassembling the mainboard and many testing hours with the yellow jumper disconnected and set back, disconnecting/reconnecting CMOS battery and
pressing power button, I found a sequence, to (sometimes) boot to the restore menu / UEFI.
But changing settings in UEFI or flashing a new BIOS file is not possible, because the NUC won't start up on next reboot. But obviously it is not possible to flash a new .bio file without rebooting the machine.
It seems, that part of the UEFI has been corrupted in a way, that makes changes and regular boot impossible.
The current installed version is 0024 (very old).
It has a W25Q64FV bios chip I could try to replace (if this makes sense at all), but I don't have a spare NUC hardware to take a working chip from.

What could have been the problem I also saw someone posted that his BIOS flasher didn't work on DX58SO. Have you tried replacing the clip wires to a shorter one? Maybe your clip has a longer wire attached same with others.

@eivrah

No clue, maybe the color used to mark the bios chip also indicate how it's soldered\glued.
That 501 board had an red mark but most of the online photo are blue marked on PIN 1.
I've used 3.3volt 150mA provided by the flashcatUSB and also 3.3volt from an external power module with 700mA but in both case nothing was readable with the VCC connected.
The CH341A didn't even recognized the 25x16 in all scenario.
If I find another board for a reasonable price and without broken stuff I'll check again.
Anyway, SOP socket for bios chip should be mandatory for consumer board, not having one is like asking for issue when the manufacturer drop the support few month later or the warranty end.
It also fall in the GPDR stuff since user data/telemetry and other things can be written on some partition\volume.

@elektron
See these pages and the linked resource BIOS Recovery by Power Button Menu or BIOS Recovery by Security Jumper

I've already done what the intel instructions say.
But as I tried to explain in my first post, this is no option, because the system is not surviving a reboot, after trying to reboot it always hangs in a no screen, no USB power, only fans running state.
Then I have to put jumper and CMOS battery away and back and power cycle many times, only to get back to the Power Button Menu.
Regular BIOS recovery/update is not possible without reboot.

@elektron

With a corrupted bios the display will never turn on with or without any procedure provided by intel.
If something is shown on display somehow;

Detach the NUC from the AC/POWER
Remove the configuration jumper
Insert a FAT32 USB with only the *.BIO file for the NUC
Attach the AC\POWER and turn it on (do not interrupt)

This procedure does not work for me.
It simply does nothing.

More likely it's a hardware issue then. I found an interesting discussion about a hardware change for the skylake NUCs:
https://forums.intel.com/s/question/0D50...?language=en_US
Perhaps the aging capacitors may be my problem, preventing the system to run... ?

@elektron

If it worked before with that memory module unless the board get overclocked by default on newer release it shouldn't be an issue.
The capacitors change will just increase the voltage capacitance to allow better clock. Mine 202 board suffered a similar fate ( it stuck at 135MHZ ).
Is the UEFI shell available? what the working option? can you take a photo? If you are able to display something either find a way to flash the bios or make a backup with an hardware programmer.

I did one more attempt to boot and flash and tried to document the necessary steps.
The system only shows the Power Button Menu after the CMOS battery and the yellow jumper was removed and set back. This needs several attemps until it works (until LED goes orange, then booting to Power Button Menu). This only works once a time.
After one reboot the screen is off, the whole procedure has to be done from the beginning (jumper, CMOS Bat, ...).

So, I managed to get into Power Button Menu and from there with USB-Stick and Iflash2 started the Flash progress. The system seems to read the data from USB and then goes to restart. After that the system stays off (no fan, no USB power) with a orange blinking LED (2 sec. interval).

@elektron

If the flash end successfully with a message and it doesn't boot after there might be an hardware or software issue.
In both case if it's either hardware or software you must check integrity. What you do next depend by how much time and resource you gonna pour into getting it back.
Mine board was a pre-production board likely made to run the first batch of a new architecture, so, tossing time for finally sacrifice another sort of working cheap board to see the difference was due.
I'm not an expert and I've got no free inventory to check on possible behavior, also, without the actual dump, it would not possible to check on anything.
To restore your bios from zero in case of software failure you will need the .BIO and a working content backup from a donor twin board.

Zitat von noInk im Beitrag #323

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@elektron
If the flash end successfully with a message and it doesn't boot after there might be an hardware or software issue.

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@elektron

Dunno, chance are it's just software, also, I'm not getting the method you are using (iFlash work in bootable DOS environment)
Since you are getting into the "Power Button Menu" I take for granted that [ESC] Normal Boot, [F4] BIOS Recovery and [F7] Update Bios doesn't work.
So, download the *.UEFI.zip from the support page and place the XXX.BIO and UefiFlash.efi on the non-bootable FAT32 USB while in the "Power Button Menu".
Plug the non-bootable FAT32 USB in the NUC and hit [F10] Enter Boot Menu - Select the UEFI: Built-in EFI Shell
At the UEFI shell without quote type "MAP -r" and hit enter.
The command should display and refresh the mapping list on which you need to locate the non-bootable FAT32 USB by size (should be something along fsX).
Once you got the right file system number for the non-bootable FAT32 USB type

fsX:

(where X is the current non-bootable FAT32 USB file system number) and hit enter.

now if you sure type

UefiFlash.efi XXX.bio

(where XXX is the bio file name) and hit enter.

There should by now a graphical output during the flashing procedure.
This could also be eventually adapted via AMT if the system is know to be alive but there no video output duo something wrong with the igpu firmware\setting.
See the UEFI Shell Update for reference.

The UEFI Shell is not set as a Boot Option. So I can't start the update process this way. Only USB device and Ethernet is shown in the F10 Boot menu.
Visual Bios is accessible from "Power Button Menu", but no settings can be altered due to hang on reboot until reset procedure of CMOS/Jumper is done as described before.

I tried to boot from Windows USB stick to get an UEFI Shell from there, but ended with "Stop Code: MACHINE CHECK EXCEPTION".

Meanwhile I managed to make an image of my 024 BIOS with FPT (without ME part, locked) from an attached FreeDOS USB stick.
Another thing, when I type memanuf from DOS it throws an "Error 142: Power source is not AC". What does this mean? Does it think I'm on battery power?


Edit:
With a prepared USB stick I managed to get into EFI Shell and to start the BIOS update as you suggested. But with no luck. I can see update countdown 3.. 2.. 1.. and then the screen go blank, blue system LED blinks once and stays on and fan is at full speed.
The system hangs the same as with any other procedure.

@elektron

To get the EFI shell if none are available just create on the non-bootable FAT32 USB the "EFI\Boot\" folder structure and place the "shellx64.efi" of your choice within the boot directory and rename the "shellx64.efi" file to "bootx64.efi".
The NUC shouldn't restart with the UefiFlash.efi till the whole process is done, but I don't own the device, so I can't confirm.
Are you doing the following procedure with the yellow jumper on normal (1-2) to enter on the "Power Menu"?

A new situation today.
One attempt with prepared USB stick and the yellow jumper pulled finally gave me a screen with BIOS restore (update) option.
The update failed with the information provided in the screenshot. This was the good news.


The bad news: since this failed update no blue power LED is shining, fan at 100% and no screen output. No matter what I do.
Pulling CMOS battery, pulling yellow jumper and setting back is without any effect.
The unit seems fully bricked. Is there a chance to get it back to life?

Probably you bricked both's FD and ME.