While trying to access the PHPMyAdmin from inside of the panel it drops into 503
After the server reboot, it shows the default login page.
If I try to log in as root it still stucks and drops 503 after a minute or two.
Roots creds found at:
/usr/local/CyberCP/CyberCP/settings.py
CyberPanel is moved away from the 8090 port.
UPD:
MariaDB is fully accessible thru the shell and seems to be working. If I am adding or removing the databases thru the CyberPanel UI - it works. When I try to access PHPMyAdmin as a regular user with the specific password - nothing changes.
UPD:
Tried this guide:
https://forums.cyberpanel.net/discussion/373/tutorial-how-to-update-phpmyadmin-to-latest-version
Nothing changed 
UPD:
Rolled back to 8090 with this guide:
Nothing changed