New apps don't work

[bst_tcc]

After the latest update both asus and google chrome, 4 out of 5 apps that i install, they just remain stuck for a long time on the first loading screen, either eventually respond and work or they give not responding app notification. Old apps are not affected, did anyone experience this issue? Anyone have any idea how to fix the issue or even rollback to previous version before latest update?

[bst_tcc]

Unfortunately Factory reset didn't help, in fact now I have even apps like YouTube giving not responding when trying to watch videos, in addition with previous issue where some apps don't work. Anyway to downgrade my firmware?

[Christine_ASUS]

Hi bst.tcc
Thank you for your reply. Have your device been rooted or unlocked before? If it haven't been rooted and already tried the factory reset, 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

If you still want to downgrade the firmware, the website didn't release Android 9 to Android 8 file, yet you could downgrade by the following steps
WW-16.2017.2005.082>(manual update)>WW-17.2017.2004.424>(micro sdcard update)>MaxProM1_downgrade_to_9>WW-16.2017.1912.060

#Manual Update Guide
https://www.asus.com/support/FAQ/1009748/
#Android 10 to Android 9 Guide (https://www.asus.com/support/FAQ/1042349)
1. Download "Version MaxProM1_downgrade_to_9" and then put the image file into the root directory of the MicroSD card.
https://www.asus.com/supportonly/ZenFone%20Max%20Pro(M1)(ZB602KL)/HelpDesk_BIOS/
2. Insert MicroSD card into phone and then power off the device.
3. Long press with "Power" key and "Volume Down" key together and stop after feel the vibration to enter Recovery Mode
4. Use "Volume Down/Up" key and press "Power" key to choose "Apply update from external storage"
5. Select the downgrade file
6. When the updating process is done, Choose "Wipe data/factory reset" and tap"Yes" to perform the master clear.
7. "Wipe cache partition" > "Yes"
8. "Reboot system now" 

[bst_tcc]

How about me upgrading to Android 10 is it possible for Asus Zenfone Max Pro M1? And no my phone was never rooted or unlocked before.

[bst_tcc]

Or even a way to downgrade my Android 9 updates, cause even with factory reset I didn't have to update my Android 9 so I would suspect is still the last version that was giving me the issues even before.

[bst_tcc]

I was able to do a little "hack" to downgrade, was also able to update to Android 10 and worked fine until Google started to auto update something at the beginning, then I started to encounter same issues. It looks like a software maybe compatibility issues somewhere cause some apps work just fine while other don't work or work with issues.