My grandson has drowned the handset (not the first time), which is now dead. I was able to change channels manually, however in a secondary attack he has gone on to the menu and changed something and now I cant get a damn thing to work. Are replacement handsets available, or can you buy a universal handset and train it, or is there a reset function I can use to manually restore settings. PS the manual has gone missing. Its a Toshiba Regza 10 months old and is fed directly by a digital aerial.