I have panasonic TH-H625DX 43" 4k tv, after firmware update the audio passthrough option missing. in digital audio setting. now only three option available 1) PCM 2) Auto 3) DD+. as result i cant enjoy surround sound in Amazon prime and netflix through AVR. although tv have optical out than also 2.1 channel audio available. before update if i set audio in passthrough mode the surround sound working fine in my AVR. Please help me restore this option in any way.