Thank you for the response! Tomorrow I will try the first two steps from this link: [GUIDE] Grub Fix Intel FPT Error 280 or 368 - BIOS Lock Asus/Other Mod BIOS Flash, since they are a bit different than the original guide I used. At the same time, I will try to apply the same procedure on the 5SCN18WW version, which will hopefully cooperate better than my actual BIOS version. Thanks for your informations and for the SPI image you sent over!

Hi! Sadly, neither the new method I tried, nor the 5SCN18WW.bin file helped me to unlock this secret BIOS option. I opened a new thread on the BIOS Modding and Problems topic and, hopefully, somebody will be able to help me for the Bios part!

I have same issue on Acer laptop, this problem probably means your laptop's ME FW temporary disabled or in recovery mode, this state of operation perhaps occured after hard reset during an update

If you will download Intel TXEInfo and run it in CMD you will probably see same thing

@marianFCBT

download FPT package with Flash Image Tool (fit.exe) and edit values which may grant write access to ME FW region for your CPU

don't forget to Enable BIOS Guard Protection Override and change Boot Guard Profile Configuration to No_FVME or VM value (!!!), this will not turn off your pc after changes done

flash new image and see if this helps

@plutomaniac

if I had no reason I would not ask/write, do you think sitting here with you it is a big pleasure?