Hi
ferdinandfilisteaThank you for your asking. Kindly provide the information below so that we could better assist you.
1. Is your Model Name ZB602KL or else?
Settings>System>About phone
Refer to the link below to check the model name by model no. in the link
https://www.asus.com/support/FAQ/1014441/ 2. Your current firmware version
Setting >System>About Phone>Software information
If you try to update to the latest version, does the issue still remain?
3. Please try to enter "Safe Mode". If the function works well in Safe Mode yet the issue remains out of Safe Mode, please check on any disturbance from the installed 3rd party apps.
# How to enter and exit "Safe Mode"
[Phone/Pad] How to Enter and Exit Safe Mode? | Official Support | ASUS Global4. Check on SMMI test
Calculator> type ".12345+=">SMMI TEST>Single Test>①BoardMic Test②BoardMic2 Test③Headset Test④Headset Mic Test
5. Are you using the earphones from ASUS? Could your earphones perform well with other phone? Could your phone work with other earphones?