I installed ubuntu 20.10 on my nuc (BXNUC10I5FNK2) all was ok. Some weeks ago, I upgraded my ubuntu 20.10 to 21.04 and all was ok.
Today I upgraded nuc bios from 47 to 52 version but now my ubuntu doesn't boot..
I tried to downgrade bios but the older bios version is 50. I tried that but it's the same.
I put the hd of my new nuc in my old nuc and my ubuntu is ok, it works.
I tried also a usb installation of ubuntu 21.04 but on my new nuc doesn't work. I tried the same with the old nuc and it works. I also tried usb installation of ubuntu 20.04, ubuntu 20.10, they work. Only ubuntu 21.04 doesn't work.
Is it possible to downgrade the bios version of my new nuc to 47?
Where can I find that?
Yes the issue occur when linux start.
Grub start kernel then nuc immediately stop. The screen become gray and nothing else happen.
As I previous said, this is happen only with ubuntu 21.04. With previous distros (20.04, 20.10) all is ok.
I tried to disable secure boot, there was a big issue with shim, but nothing is changed.
With bios version 47 all was ok.
Linux is not supported in your NUC. Downgrading BIOS is not recommended either. However, if you must do it, do by BIOS Recovery by Power Button Menu (if this will not work, you should try BIOS Recovery by BIOS Security Jumper Removed method):
1. Prepare USB stick fully formatted to FAT32 (disable quick format option during format). Format your USB on Windows machine (rather than Linux or MAC).
2. Extract the FNCML357.cap from the FNCML357.0047.RECOVERY.zip file I'm attaching to this post. Copy the FNCML357.cap to the root of the previously prepared USB stick. Insert this USB stick into rear USB port on your NUC.
3. Press and hold Power Button for about 3 seconds. Count 1001, 1002, 1003. Release the Power Button. NUC should reboot into Power Button Menu (this will take about 60 seconds). You should release the Power Button before 4-sec shut down override or when the Power Button LED changes color from blue to amber.
4. Press F4 and the recovery shall start (it can take up to 30 seconds for messages to appear on the screen). When the recovery finishes, NUC will automatically restart. Remove the USB stick.
5. Reboot your NUC and enter BIOS again (F2). Reset BIOS to default settings (F9), (F10)
6. If before update, you have customized bios settings, you can enter again to Bios setting to change the necessary settings.
thank you so much.
About linux supporting I think that intel supports only window 10 on nuc. This is cause I ask to the community. Almost all vendors do the same but always linux works.
I agree with you about downgrade. An upgrade should fix bugs, so a downgrade inserts known bugs...
I hope this is the reason. Is there a chance that my nuc become a brick after the downgrade?
I'll try to find other solution with linux community before to downgrade, or better intel fixing the problem with a new bios release.