If you got help in the chat and have opened a thread prior to that, please write down the solution in the thread so others can profit from it as well ;) The problem was that the pic was programmed to id 6. So all that was needed was to open MIOS Studio, set "device id" to 6, load the change_id_00.hex, upload. Now the core was correctly set to ID 0. Next, we changed the "device id" in MIOS Studio back to 0, loaded the sid software - DONE ;D