I do have another idea…
there is some odd wording on the iCopy website that COULD be interperated as the iCopy only works with iCopy Cards…Which would be a dick move with proprietary cards, but if you are getting successful read / writes with the iCopy cards on the iCopy, that could also be a reason for not being able to write to your NExT.
Do you have non iCopy cards/fobs to rest with?
Again, I don’t know the answer myself, but hope you can do some testing for us…
aka Rosco had a question for you also