If you changed the Key blade AND RFID chip to the new one, I could see it working - cause the unlock/lock is customer programmable. But how the SKREEM is reading the new RFID and accepting it is beyond me. If this really is the case, you have bad news: The anti-theft part of your SKREEM is not working.

And you have good news: The SKREEM is not checking properly so maybe yours will never freak out and leave you stranded. At least, that could be the case.