I upgraded my system from the OEM installed Windows 8.1 to 8.1 Pro using a FULL license (not the cheaper upgrade license).
I understand that with an upgrade the original key is replaced by the new one but in this case I didn't just use an upgrade key but a key okay to install on a separate machine. The "add features" option in the control panel let me upgrade using this key.
If the original key was stored in the BIOS/UEFI, has that been written over with the new key? Is my original key gone forever?