Topfield TF 5100 PVR - Manual (Page 71)

9.3 From another digital receiver via RS-232 port 65
1. Plug one end of a RS-232 cable (9 pin D-
sub cable) into the RS-232 port on the
digital receiver, and the other end into
the matching port on the other digital re-
ceiver.
2. Turn on both of them.
3. Select the Installation > Transfer Firmware
> Transfer Firmware to Other IRD menu.
4. Restart the digital receiver.