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0e1f616
(Get the code!)
I've also got an Avantree DG80 as a workaround and I can confirm it works with my Trekz OpenComm headset. It supports sounds up to 8 kHz (corresponding to mSBC with a 16 kHz sampling frequency) with the mic enabled, while anything connected directly to Linux bluetooth only goes up to 4 kHz in HSP/HFP mode (CVSD). The sound with mSBC is still noticeably worse than in A2DP mode when listening to music, but a lot better than CVSD.