Btc8490e error while updating ep reg
Double-click the folder HKEY_LOCAL_MACHINE to expand its contents.
An environmental protection order may be issued to a person undertaking environmentally relevant activities to require compliance with environmental obligations.
If you’re trying to edit or delete keys from the registry to repair or recover from certain problems, you might find that some keys won’t let you do anything with them and you’ll get an error such as “Cannot delete xxxxx: Error while deleting key”.
These keys are usually protected to stop accidental deletion and it’s important you have the correct key before trying to change it.
Since I always back up the original fresh install with activation.
I decided to restore the image, ran all Windows Updates and this time it updated to 8.1 successfully.