Additionally, you may also notice the following events getting logged in the Application event log:
- Service Tag or the Service Number is not updated by the OEM vendor after motherboard replacement.
- BIOS contains a default or a garbage value for Service Tag.
- BIOS has incorrect product information
Note: To check the Service Tag number on a machine, run the command: wmic bios get serialnumber
Upgrading the BIOS is an effort to put the correct SLIC table on the machine. Software Licensing Description Table (SLIC) is a digital signature placed inside the BIOS by the system manufacturer. The OEM-SLP Key, and an XML formatted OEM certificate (issued by Microsoft to each OEM) will be verified against this OEM-specific SLIC and auto activate if everything is in order.