I beleive you've misunderstood the wrong question.
My modulator is already uhf ch21-69.
The problem is with the "simply perform a retune"...
Retune process stops at IR connectivity screen.
The message is "No IR Hardware Identified"
The problem occurs when attempting to re-tune the 610 to the cable box.
With no aerial connected the same message occurs.
The problem is that the HP-610-Hardware & associated Ms-Media-Centre-Setup-Software expect "Coax+IR-Cable" connectivity, whilst the newer uk cable boxes have only "HDMI" or "Skart" output, which has the IR connectivity included, & no "Coax+IR-Cable" output.
The modulator sorts out the video signal, but I need the work-around to the set-up tune-in software, which looks for the IR connectivity, & hangs when not found.