I did the following in October 2011 on my Samsung UE40C6700 with the firmware
The following was taken from http://wiki.samygo.tv/index.php5?title=Enabling_the_PVR_for_C-Series&oldid=1807
The following typografical conventions apply in the following: buttons to press on the remote are written in bold, menu items that appear on the TV are written in
Be very careful what you press on the remote whilst in service menu. Move through menu list by pressing down or up arrow only. Only press right arrow to change an option.
NOTE: All user settings (and TV channels) will be reset to default after this so write all your settings down on paper and reset them afterwards.
BE CAREFUL IN THE SERVICE MENU!
HOTEL MODEto ON (right arrow) and then turn off TV.
Controland select this (right arrow) - new menu appears (S2) - move down to
Hotel Optionand select this (right arrow) - new menu appears (S3) - move down to
Clone TV to USBand select this (right arrow). TV then checks USB. - Wait until the message
Completed Successfullyappears. - Select
OKby pressing enter.
Sub Optioncategory and select (right arrow).
PVR Supportand set to ON (right arrow). (Move to
PVRby pressing down button, not right!!!) This option now appears on its own on the TV screen, press return to go back to main menu again (S5)
Gemstar Supportto ON if required for the GuidePlus EPG.
RS232-Jackto Debug (this is a safety measure)
Watchdogto OFF (this is a safety measure)
Hotel Optionand select this (right arrow). H1 menu appears then set
Hotel Modeto OFF (right arrow) and power off your TV.
If you now press record or pause whilst watching live TV the TV will ask to format the USB drive. If this is done successfully the PVR function should now work and you enter timeshift mode and begin to record to the USB.