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Sound is not balance on both channels(Asus zenfone 5z) while connected to bluetooth earphones.

When I listen to the song from my OnePlus Bluetooth earphone, The right chhanel sound is much louder as compared to left channel. I also try to other bluetooth earphones but same problem occurs. I also do the reset my phone but Notting happened. How to fixed this issue.
Phone model: Asus zenfone 5z (Z01RD)


Zen Master III
Hi, Please try the troubleshooting tips below:
1. Please try reset Network: Settings>System>Reset options>Reset Wi-Fi, mobile & Bluetooth
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"
3. Also, please try "the Factory Reset" after backing up all the data.
Settings>System>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.
4. If the issue persists after troubleshooting above, please check your SMMI test: Calculator> type ".12345+=">SMMI TEST>Bluetooth
If any of the SMMI tests fails, indicating the high possibility of faulty hardware, kindly bring your device to the nearest ASUS repair center for device checking:

Thanks man.. Now working fine