Thanks.
This description of the values should be documented on Microsoft Learn pages!

I tried to set 0x0040 and run the task after reboot, but still the same freeze. 
As already said last month, I suspect the UEFI is simply badly implemented in regard to SecureBoot. It was one of the very first mainboard with SecureBoot in 2013/14...
So I think this mainboard simply do NOT allow any change in the SecureBoot settings. In the bios itself, there is also no other option than "reset key" to default .

As for Servicing values in Windows re:

• BucketHash is 

  90d5affce870e9b93ad23b45571bb389302ade84cbf4da5253d6d709ed043739

• ConfidenceLevel is empty
• UEFICA2023Error and ErrorEvent are 0
• UEFICA2023Status InProgess
• WindowsUEFICA2023Capable  is 2

And other parameters:

• Telemetry let to the "Require" setting, I suppose the SecureBoot stuff should be part of it.
• No third party antivirus, only the Microsoft stack. The machine still has win10 22h2 with ESU / March 2026 update
• No gaming on this old machine, so no Anti-Cheat software AFAIK
• Hypervisor activated and virtual box installed