I need assistance,
Bought and installed 3 days ago and I never got no sounds during any calls. Tried rebooting my Iphone 13 and the audio unit still no change.
I also get a thump noise from the speakers when turning on and off the acc of the vehicle.
I am wondering If i have a defective product? Or any software updates? Anything helps.
eveythingelse works so far.
Please before I make any return.
@Support Dasaita please help Thank you
@Jeric Vergara
Hello,
Thank you for your contact .
Please take a picture of Settings>About machie> MCU .
We'll send you a new MCU to update.
@Support Dasaita 
@Jeric Vergara
Hello，
Thank you for your kind reply.
Please update the MCU to resolve no sounds for phone calls.
MTCHS_ZST_V4.15f.zip
https://www.dropbox.com/scl/fi/zjk57mppsli9nnmc9vubs/hmcu.img?rlkey=buxs8jrlxzn00j4488ze6sc0d&dl=0
1.Download the files via link on computer.
2.Copy to the USB driver and insert to the USB cable
3.Go Settings>System>MCU updated
Thank you for your time.
Thank you for the update.
but I still have no sounds during calls. I cannot hear them, they can't hear me. I mostly use carplay. I tried unpairing and resetting both phones and the unit still the same issue.
@Support Dasaita 
that MCU update is for G12 or G13?. You never asked for which model of headunit had the customer.
I have G12 under Android13. Is there any MCU upgrade for the G12unit? I currently have some microphoone issues;
The microphone works ONLY for calls, but never worked for any Android app, I cant use the google assistant
@Iker Gomez they should be aware that I have G13. And I don't think we have the same issue?
@Support Dasaita Please continue help me navigate this problem. Thank you
