SETUP*__**9*8*0* should reset your Cinema6 to the default setting.

I don't know why you would want to use the TV's mute if your receiver is playing the sounds. Can you be more specific? To make your TV the muter and volume controller for ALL devices use:

SETUP*__**9*9*3**TV**
After doing this you can go into any device you DON'T WANT to use the TV's controls and use:
DEV*SETUP*__**9*9*4*DEV*MUTE*MUTE** to get that device's mute back. Use the same sequence to get volume up and done back. Maybe.

Dave