Hi
jahir1378mynThank you for your asking. I just tested my ZB602KL with V429, which the ringtone performs properly.
1. Kindly check on your sound settings
Settings>Sound>Ring volume
2. 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"
https://www.asus.com/support/FAQ/1005163/3. Also, please try "the Factory Reset"
Settings>System>Advanced>Reset options>Erase all data(factory reset)
Please note that once the Factory Reset is completed, all data, apps, settings and personal information will be deleted.
If the issue remains the same, kindly provide me the video of the setting process and the ring tong during call-in. If you have any further queries, please do not hesitate to contact me.