Hydra 32 Bluetooth error?

[Foxchase]

I'm trying to set up 2 Hydra 32s (bought used by someone who only ran them for 3 months. He showed me they both worked fine).

I got one to connect fine. But I keep getting an error message whenever trying to connect the other one.
What do I do?

 

[Saltyreef]

Reset light delete and re-add

 

[Foxchase]

Reset light delete and re-add

I did the hard reset. Where you unplug from power source, hold button, plug back in and release. Still not connecting

 

[Saltyreef]

I did the hard reset. Where you unplug from power source, hold button, plug back in and release. Still not connecting

You may need to erase it from the app too.