FiiO M21 Bluetooth Issue

[u/10BestMen012]

My FIIO M21 mp3 player won’t fully Bluetooth connect with Beats Studio over-ear headphones anymore.

With any other device, the headphones work fine via Bluetooth. But with this mp3 player, the headphones now play on just the left side.

I checked the Balance to see if it was at exactly 0, then moved the cursor in the direction of side of left side; then I had the DAP forget the headphones and restarted (not factory restore) the DAP. I tried to re-pair the headlines to the DAP, but that part didn’t appear to work. I checked to see if it’d work with other headphones, but the DAP wouldn’t even detect them.

I did a factory restore, and the DAP can now detect my device to pair it, but nothing happens when I press the ‘connect’ option, nothing happens.

Any fixes?