Aukey EP-N5 - Volume Control Issue

Hi,
I have an issue with my earbuds - the volume control.

So basically sometimes when I put the volume to zero I still can hear whatever music I put on my phone. And it’s pretty loud but there is nothing I can do about it to turn the volume down.

Sometimes when I put the volume to zero I cannot hear anything (which is good). But then when I turn up just one bar up the volume is already too loud.

So it’s like you can hear nothing or the music is too loud and there is nothing in between.

I pair them with an iPhone 12. I love everything about these earbuds except the volume control.

  1. How to do factory reset?
  2. Is there any app I can download to tweak the setting?