Weird, others have said you don't need to reboot for it to change.
You can always subscribe to the thread, like me.
In fact, 80 just means:
Note that, if you do a Factory Reset from the System Information screen, if your fourth byte is 80, it will get automatically changed to 00 (disabling PAL) and the first two bytes will get changed to 55 53 ("US").
I will leave it to others to explore further values. Note that this means folks can change their BH200 to, say, play Region A BDs by changing the Model to USA or CANADA, but still keep their native language menus.
00 = ENGLISH
01 = SPANISH
02 = FRENCH
10 = (null), defaulted to English
Who's brave enough to play with byte 7?
bytes 1&2 = Country
byte 3 = Initial Language
byte 4 = Model + PAL bit
byte 5 = enable/disable status of BDRE/BD/BD9/HDDVD/3xDVD, probably one bit each
byte 6 = Screen Saver delay
byte 7 = Show Mode and Admin Mode
byte 8 = Auto Power Off delay (or maybe just enable/disable)