I have a pioneer SC LX 86 receiver. I have recently connected a Sony 4K UHD blu-ray player and The Amazon 4K Firestick to it. Also connected is the 1080p Apple TV and a Iphone 8 through the USB port on the front panel. The Amp is connected to Epson 5040 projector which as all know is HDCP 2.2 compliant. Apple TV 1080p works fine. I am having the following issues:\n\n1. No picture from Blu Ray player and also from fire Stick 4k.\n2. No sound from the IPhone\n\n\nSince the receiver is 4K passthrough, should the receiver not be able to pass the 4K signal to the projector which should be able to display since it is HDCP compliant?\n\nalso how to switch on the pass through function on the receiver should it be required?\n\nalso why is the iphone not able to play music through the iphone USB port on the front panel?