As I said above, remove the data folder.
You mean uninstall, remove the obyte folder not a data folder inside the obyte folder, reinstall and start as import full backup.
No, I mean just removing the data folder. You don't need to uninstall or do anything with the program folder.
I hope all my tokens and blackbytes (still alive) are then restored.
Can I import the full backup to a lite wallet?
Of course, the wallet will become what the backup was. The previous wallet is fully overwritten and it doesn't matter whether it was full or light.