HI .. there is always updating keys sometimes every day . But sure not all the provider change there keys my qustion is .. if i taked my old via hexfile and i changed the keys only in the eeprom file .. will that work even i'm not changing the pic hex file .. plz help me
yes, this is possible, and indeed it's the recommended way of going about things (i.e. Find a fileset that in terms of functionality and compatibility with your equipment is one that you're happy with, and then just keep editingt the keys in accordance with the specific channels YOU want to watch). It has been discussed many times on this board before.
But bear in mind that almost all filesets use the eeprom file to store keys, and that the eeprom on a wafer can only be reached through the PIC. So even though you only need to change the contents of the eeprom, you still end up reprogramming the PIC as well since you need to put a loader on there to gain access to the eerpom in the first place. With DIL (loose) chips, this isn't an issue of course.