My KD-55X8509C received a software update on 29 March and since then my RMT-TX1000 remote control will not change channels ie up/down programme buttons and numbers buttons don't work. All other buttons  eg on/off, home, guide, volume etc etc all work fine. This suggests to me that the update has caused the problem.

However, I have tried all the various "tricks" suggested by forum members like pressing each button, but none work. According to other posts here Sony Support are not helpfull on this subject. Does anyone have any ideas/thoughts?