To release the Hotel mode option, you have to enter its service mode. If you wish to get some details; visit the site linked here.
Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.
NB: Please read and understand well, the instructions to enter the service mode, before you begin. Be very careful.
Note how to "EXIT" the service mode; after entering and adjusting data. This is very important.