Meizu

Disable Battery Optimization

Settings > Battery > ellipsis in the top-right corner > Battery Optimization > at the top, select All Apps > find your app > choose Don’t Optimize (in some versions — Don’t Save Power).

Disable Smart App Deactivation

Settings > Battery > gear icon in the top-right corner > disable the toggles for Smart Sleep and Scheduled Operation.

Adjust Advanced Settings

Configure the following settings (item names may vary depending on the system version):

• Settings > Additional Settings > Battery Manager > Power Plan > set to Performance
• Settings > Additional Settings > Battery Manager > Protected Apps > add the desired app to the list
• Settings > Apps > select your app > Battery > enable High Power Consumption Request and Keep Running After Screen Off

Disable Background Auto-Cleanup

Settings > Apps > select the app > Auto-Start > allow.

Remove Power Saving Mode Restrictions

Settings > Battery > Power Saving Mode > select Normal Mode.

Disable Deep Sleep in Flyme

Settings > Battery > App Sleep > remove the app from the list.