Earfun Air Pro 4 very low sound in left earpiece

Hello,

After the update to version V 0.3.3 I have very low sound in the left earpiece.

I tried to reset them (hold the case button for 10 seconds), reset to factory settings in the application, clean the earpiece, nothing works.

I want to mention that both earpieces are 100% charged and the touchpad is still working.

Can you please help?

Kind regards,

Vali