If someone is not too familiar in doing something similar I think it is worth my mentioning a couple of points.

Humax Remote Control RM-F01 - Issues | AVForums Humax Remote Control RM-F01 - Issues | AVForums

I used cotton buds and methylated spirit to clean the printed circuit board. Ensure the chrome ring is reset correctly at NSEW positions and that the battery springs are in the right place. When handling the PCB be careful not to touch the board printed circuit or the on board chip with bare fingers as I would be a bit concerned that ones body static may damage the chip. I am not sure how static tolerant chips are these days; it used to be a problem some years ago, where static could destroy electronic chips. Of course if one earth’s themselves, (I do it by touching the bare steel frame of my PC that happens to have the cover off), then there is no problem.

Thanks very much for the information. I too used brute; case is rough round the edges, so sandpaper next!

RM Series Replacement Remote Control for HUMAX RM-F01 RM Series Replacement Remote Control for HUMAX RM-F01

Holding the remote horizontally, i/r window to the left (I'm right handed) with the side of the remote facing you, peak over the top and draw an imaginary line across the remote towards you from the top of the "OPT+" button. I followed Philip Bradbury's method and it worked perfectly, without any lugs broken. It took me about 1/4hour in all to do - don't be scared to try it - you shouldn't to force it off. The RM-109U also controls the HD(R) Fox T2 but has a few seldom-used buttons missing and only controls the HDR and TV using the MDB1.3_01 code library.Lets you turn on display of recording crid codes in programme info. Handy when the box comes up with odd recording clashes.