You do have to WAIT after they are reset a good few seconds.
Liberty Neo - left earphone won't work
For those still with this issue, the solution is that you have to put them in the case first, then press and hold the button for about 5-8 seconds on each (at the same time) until they turn pink/red for about 2 seonds. Then you can take them out and re-pair them.
Me too. Have been able to fix it