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priittoobla: Thank you very much for joining the Intel® NUC communities.
In order to try to fix this problem, we can try to do a clear CMOS:
Just for testing purposes, could you please go back to BIOS version 0045:
If the problem gets fixed that way, then please try the BIOS update to 0046, 0047 and then 0048:
Any further questions, please let me know.
thank you very much for your response.
As I noted in my original message, I have already tried resetting BIOS settings to their defaults Just in case, I tried again- still has no effect on the issue.
As per your suggestion, I tried to downgrade from 0048 > 0045 - it failed with error message (see the first attached image DSC_7172.JPG):
Flashing image for Intel(R) Management Engine firmware ... - FW Update Sample Application Error FwUpdateFullBuffer [failed!]
Flash update failed!
Technical information: (0x8000000000000015, 0)
Then I tried to downgrade from 0048 to 0047, it succeeded, but the issue was still there- the HDD LED was lit all the time.
Then I tried to downgrade 0047 to 0046 and 0045 and those tries also failed with the same error as before (see attached images DSC_7177.JPG and DSC_7178.JPG)
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1. Enter bios setting (press F2 during boot).
2. Go to Advanced > Power.
3. In the Secondary Power Settings pane check if the Ring LED field is not set to Power State Indicator. In order to use this led as HDD activity indicator, you shall set it to value: HDD Activity Light and in addition in Advanced > Devices the HDD Activity LED shall be checked.
In order to disable the Ring Led leave the Advanced > Devices the HDD Activity LED unchecked while in Power setting it is set to HDD Activity Light.
4. After making any changes to the LED settings, press F10 (followed by Yes) to save and exit BIOS Setup.
Hope this will solve your problem