This firmware (for the TRF-2400, TRF-2460, TRF-5300/5310/5320) fixes the playback navigation problems with MPEG4 (H 264) recordings. There is no firmware fix for the TF7100HDPVRt.
It can be downloaded from the oztoppy wiki: http://oztoppy.wikidot.com/firmware-list
Ian