MPEG4 is basically a newer/better version of MPEG2. It allows better video signal compression and thus offers clear audio/video.
Can my MPEG4-compatible receiver decode MPEG2 channels?
Yes. MPEG4 technology is backward-compatible. MPEG4 receivers should be able to handle MPEG2 channels/content easily.
However, MPEG2-only receivers cannot decode MPEG4 channels.
Can I upgrade my MPEG2 receiver’s firmware so it can handle MPEG4 channels?
No you can’t. You need an MPEG4-capable hardware.
Strong SRT 4669x is a popular MPEG4-capable satellite receiver.