PVR activation on Samsung TV C series without firmware downgrade...
1. Turn on TV, on remote control key: MUTE-1-1-9-ENTER, set HOTEL MODE to ON and then turn off TV.
2. Invoke service menu by pushing INFO-MENU-MUTE-POWER on remote control. (If this doesn't work try MUTE-1-8-2-POWER)
3. Put in USB HDD/flash formated to FAT32.
4. In service menu go to Control - Hotel Option and click on Clone TV to USB, then push 'return' on remote and choose Sub Option category.
5. In this menu set PVR to ON. (Move to PVR by pressing down button, no right!)
6. Go back and set Hotel mode to OFF and power off your tv.
7. ENJOY your PVR.