Thank you for your asking. For ZE620KL camera blurry issue, kindly try some stay-at-home troubleshooting tips below:
1. Please try clearing cache & storage of Camera (long press "Camera">App Info>Storage & memory>Clear cache/Clear storage), and try to re-install 3rd party camera apps and check again.
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. Please check on SMMI test, could the device pass the SMMI test?
Calculator> type ".12345+=">SMMI TEST>Single Test>Wide-angled Camera Capture Test/Tele Camera Capture Test/Front Camera Capture Test
*If your SMMI test is pass, please try "the Factory Reset"
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.
If the situation remains the same, according to what you described, please contact ASUS repair center in the country of your residence: https://www.asus.com/support/Service-Center-All-Countries/
If it is impossible to access the service center during Covid-19 period, please try Call us: https://www.asus.com/support/CallUs