From the ElkRP2 Software and the Send/Rcv, Enroll/Update Control and Devices screen make sure the model is the M1XRFEG and not the M1XRF2G receiver to support the GE/Interlogix 319.5 MHz Frequency sensors. If it is the M1XRF2G then you will need to rollback to Firmware 5.2.10 . If you confirm it is the M1XRFEG check under Wireless Setup OPT1 should be checked , OPT 2 should be checked and the LOOP Set to 0