Unfortunately, even after updating to the latest firmware, I still cannot use aptx Bluetooth Codec: It is greyed out in the developer system settings. I got a Fairphone 4 with O2 in Germany.
That normally means the BT device does not support the codec!?
No, I’m using Bluetooth devices supporting aptx like Sennheiser Momentum 3 Headphones or JBL Xtreme 3 speaker.
Moved your posts here maybe others confirming it is working can help out
My issue is resolved, my fault: HD Audio was turned off in my settings. I have turned it on and now aptx works fine!
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I still have troubles with my Libratone Track Air+ with FP4.SP2G.B.079.20230624:
After connecting the TRACK Air+ left, a popup for pairing the TRACK Air+ right should appear, but it does not. After pairing the Libratone TRACK Air+ left “aptX” is shown, but no pairing of the right one. Also the left one is not connecting automaticly by taking it out of the case. I have to connect it manually.
I also resetted the earbuds. No change.
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Well, it’s a letdown for me. The issue is not fixed. My connected amp does supports Aptx but it still won’t work after the update…It works only with audio HD off 
Edit : wait wait wait. I installed the update this morning and I can download it again. Here I go, I may have spoken too fast. I’l edit if it works
It works !!! Nice !
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Yay 
My Koss Porta Pro Wireless headphones started working again!
The option is only available if a AptX capable device is connected.
The bug in the past was not that AptX is not available - it just did not work, so you needed to disable it after connecting a headset to avoid problems.
My issue is resolved, my fault: HD Audio was turned off in my settings. I have turned it on and now aptx works fine!
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