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https://www.sony.co.uk/electronics/support/oled-tvs-android-a9f_af9-series/kd-55af9/downloads/000164...
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https://youtu.be/mOgCsZMx1vE
The sound on my internal apps no longer work on my AF9 since the update.
I dont have this problems, try factory reset
Already tried factory reset on my AF9 ,no difference