If you have one with a mono plug then it is already "compatible". The fact that the plastic moulding of the plug had a purple dye put into it when manufactured won't somehow alter the way it transmits the IR signal, and the IR Blaster is functional if it is kind of working at present suggesting code incompatibility rather than faulty hardware. I'm also basing this on that you have also tried using the IR Blaster built into the front panel "eye" of the TiVo rather than the external IR Blaster and getting the same result? Or is there some other reasoning behind you wanting to try a different IR Blaster as I am assuming it previously worked OK for you on another box?
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