Update: firmware took successfully.....
But the firmware appears to nuke AFD (auto format detection) on some channels. For example
dolby digital is passed through the TV to the receiver fine for most channels when the sound field is set to AFD, but when using ITV HD or Channel 4 (through SkyQ), the sound drops out and sometimes voice channel is played through the sub or only background channels are audible. The signal information confirms the signal the TV is receiving from Sky is dolby encoded.
Changing the sound field setting to "Multi" or "2 channel" cures the issue for all channels, AFD works on Sky channels such as Sky Sport .etc
Slim possibility it might actually be the receiver, not the TV, as prior to turning the power off at the wall, the receiver was also failing to connect to the internet (despite several attempts to reconnect to wifi or use a ethernet connection).
Will continue to have a play around, possible need to reset the receiver to factory settings.
The purpose of updating the firmware was to stop total sound loss to the receiver, sound could only be restored by restarting the TV.
Config
Sky Q > A95L, HDMI 4
TV > Receiver, AN-TA1000, HDMI 3
eARC
pass through enabled
