Is it recommended that you hack the GH1 to GH13 first and then update the lense firmware? I haven't had a chance to hack mine yet.
If I update the lense first, will it lock up the GH1 body firmware protection scheme?
Lens firmare is residing on the lens and is totally independent of the camera firmaware. You can update the firmware in any order you please.
The camera is just the conduit for lens firmware updates.
Good luck.