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New apps fail to install

Star I
ASUS Max Pro M1 Android 9 Not rooted
Recently the phone was updated to 9 and after wards I am unable to install several applications. The installer just exits informing not installed. I also checked settings and find that the setting for permitting installation of applications from other sources is missing.

Zen Master III
Hi there, kindly share latest firmware version of your device.
also, you may follow the below steps:
1. Clear system cache.
2. Try the same under safe mode:
Hold the power button for 5 seconds => When the screen flashes with option => Press & hold power option => You will get an option to restart in safe mode
3. If still you face the issue
factory reset your phone after taking a full backup :
4. Last option would be to visit the service center to have
a check. Locate here: