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CAS 3 Programmer

My Satellite Setup
Echostar 808 2ci Conax
I have just bought a CAS 3 programmer and used it successfully to programme a Matrix Revolution cam to upload MRB301.
However when I try to use it to upload predator 3.21 for my Dragon cam, i get an error message saying, can't read card. It work as a CI host but no to reprogram???? Any odeas??