Hi there,
the FHL Bios is a newer version than the FHh so I would leave it alone, especially if everything is working fine.
For future reference BIOS versions are either alphabetical, for example FA, FB, FC or alpha numeric, for example F1, F2, F3 etc if they are full versions and FAa, FAb, FAc or F1a, F1b, F1c etc if they are beta versions.
Hope this helps