So I’ll add this as a separate answer, as I haven’t seen it mentioned yet.
The left ear on my Crossfade 2 wouldn’t work when using Bluetooth, but it would using an audio cable. (I use the one given with the Crossfade). So I tried the above mentioned fixes, the firmware reset and audio cable plug-in and plug-out, but it still wouldn’t work.
I then tried the cable plug-in and plug-out with a different audio cable (in this case the audio cable from an Astro A40 TR), which did in fact fix the problem.
I have no idea why, but it worked. It may be worth a try if you are having the same issue as me.
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Edit: I also wanted to add that there was a difference in volume after the left one started to work again. This was fixed by maximizing the volume on my laptop, and then putting it back to normal.
So I’ll add this as a separate answer, as I haven’t seen it mentioned yet.
The left ear on my Crossfade 2 wouldn’t work when using Bluetooth, but it would using an audio cable. (I use the one given with the Crossfade). So I tried the above mentioned fixes, the firmware reset and audio cable plug-in and plug-out, but it still wouldn’t work.
I then tried the cable plug-in and plug-out with a different audio cable (in this case the audio cable from an Astro A40 TR), which did in fact fix the problem.
I have no idea why, but it worked. It may be worth a try if you are having the same issue as me.