Small correction here. Hybrid LNB's (and the DPH42 for that matter) are retro compatible with DPP/DPX technology and will handle any receiver connected as long as its not a legacy receiver (4-Digit Model number). I have gone back as far as having a 311 work with a Hybrid LNB just fine. You are not able to connect a VIP receiver to the same Hybrid LNB a Hopper3/Duo is connected to making a DPH42 necessary in that scenario, but for the purpose of a downgrade changing the LNB is not required.Specifically you must have a DPP LNB and the correct switches and hubs.