Remember that everything is carried by the upper plate (the circuit board and button rubber is lightly clipped to it); including the battery springs which should lift out of their holders as you prise the cases apart. I inserted the tip of the small blade of a Swiss Army Knife into the seam that runs all around the remote 3mm from the top. I started about 90mm from the IR transmitter (between two lugs) and gently eased along the seam towards the middle of the remote, pushing out the side slightly and levering up the top, until the first lug popped out of its slot halfway along. I then carried on with this technique until all 14 lugs were popped. I found it easier to pop the end lugs after all the side lugs were freed. None broke and very little force was needed. The lugs are symmetrical each side and are positioned as follows starting from the IR end (top): 20mm, 65mm, 115mm (centre), 165mm and 210mm - each measurement to approximately the centre of the lug. There are two lugs on the bottom 15mm from each corner and two at the IR end 10mm from each corner.

HUMAX RM-F04 Genuine Foxsat HDR FOXT2 Freeview Remote Control HUMAX RM-F04 Genuine Foxsat HDR FOXT2 Freeview Remote Control

So it's not the remote. Thanks just tried it again - yes my HD remote does use the 4 digit codes - you have to press OK after each code to then test it - it doesn't send a power off after entering the 4 digits as stated in the manual which makes it slower to find the correct code. Start in the middle and work carefully upwards and downwards.

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Once all the lugs were popped the keyboard complete with circuit-board lifts off the housing and there are no connecting wires. To remove the circuit board there are 4 plastic lugs. I eased the board from underneath the bottom two (one at a time) and it came easily away from the top two. The buttons are all on a single rubber sheet which lifts off and can be cleaned by washing in warm water with a drop of fairy liquid. Rinse thoroughly in clean water (preferably de-ionised) and thoroughly dry before re-assembly. Ensure the loop of springy wire connecting the batteries is still in place in the housing before re-assembly. It is easier to engage the top and bottom lugs before the side lugs are clipped as there is more give in the sides. If someone is not too familiar in doing something similar I think it is worth my mentioning a couple of points.

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I first removed the batteries for safety. The top and bottom are totally separate (no wires) when they come apart. There were no screws holding this remote together Press and hold the 0 and OK buttons simultaneously for 5 seconds until the PVR button on the remote stays red.

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Your typical remote uses plastic clips molded into the body to hold the top and bottom halves together. Sometimes, you might need to push in either the top or bottom edge along the seam to help pop the clips apart.