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

Windows 11/10 Activation error 0xC004F012 occurs because of a missing or corrupt licensing repository. It can occur first-time activation or after a major upgrade ...

Testing for co-integration combines the problems of unit root tests and tests with parameters unidentified under the null. Seven statistics are formulated and analyzed.