If after a hardware change and you encounter Error Code 0x803FABB8, Donor hardware ID does not own operating system entitlement, see this fix.

The activation threshold It has long been the case that Windows OS activation is tied to some kind of secret composed value that’s calculated when a license gets tied to a specific PC.

If you are encountering the Windows Update or Activation error code 0xc004f075, then this post might help you fix this problem.