Why doesn't app automatically start after I reboot the device?

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Some devices built-in an auto-start manager (or management) function which prevents our apps from auto start-up after you reboot the device.

Usually, you can find it by going to:
* Launcher > Settings > Security > Auto-start management

or

* Launcher > Settings > Security > Permissions > Auto-start management

or 

* Launcher > app drawer > Auto-start manager (or auto-start management)

or

* Launcher > Settings > Battery > Launch > Turn off the switch for our app (i.e. Manage manually)

Please add our apps to the allowed list.
It's better to also add our apps to the battery optimization ignored list, please visit http://bit.ly/2EEMD4o for how to.

Here also listed some examples about how to add our apps to the whitelist:
THESE INSTRUCTIONS ARE NOT EXACT. With over 17,000 different Android models from all over the world, every device is a little different. If you don't see the exact same things as listed here, poke around in the Android Settings or on the home screen for an app that might be the "battery saver", "optimizer", or memory cleaner options. There might even be multiple options.
Asus devices:
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* Launcher > Settings > Battery > PowerMaster > Auto-start Manager > switch to "Allow" for our apps
Huawei devices:
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* Launcher > Settings > Apps > tap our app > Battery > turn off the "Power-intensive prompt" option > tap the Launch item > turn on "Auto-launch" and "Run in background" options


 Lenovo devices:
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* Launcher > Settings > Power manager > Background app management > add our apps to the unrestricted (or allow auto-start) list


 OnePlus devices:
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* Launcher > Settings > Apps > tap the top Gear icon > Apps auto-launch > either disable Apps auto-launch or check the box next to our apps to move it to the "Allow auto-launch" category
Oppo devices:
================================
* Apps drawer > Security center > Privacy permissions > Auto-run management (or Startup manager) > turn on the switch for our apps
Samsung devices:
================================
* Launcher > Settings > Security > Auto-start management > set our apps to 'Allowed'


Vivo devices:
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* Apps drawer > iManager > App manager > Autostart manager > allow our apps to auto-start in the background


 Xiaomi/MIUI devices:
================================
* Apps drawer > Security app > Permissions > tap Autostart > allow our app to autostart by turning on the switch
or
* Launcher > Settings > Apps > Permissions > Autostart > allow our app to autostart by turning on the switch

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