Couldn't load bitmap error AND poor sound quality

[ankit93868]

Please tell us some basic information before asking for help:
Model Name:Zenfone Max Pro M1
Firmware Version: latest stable pie
Rooted or not:not
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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After downgrading from beta3 to stable pie
1. Sound quality become worst
2. During cleaning Boot chache. It shows couldn't load Bitmap

[victor010]

Hi, we'd request you follow the below steps:
1. Kindly factory reset your phone after taking a full backup: https://www.asus.com/support/FAQ/1006346/
2. Last option would be to visit the service center to have a
check. Locate here: https://www.asus.com/in/support/Service-Center/India