Huawei (Android 6 and Later):

• Setting => Advanced settings => Battery manager => Protected apps => Check "System Update Core Service"
• Setting => Advanced settings => Battery manager => Power usage firewall (power-intensive apps) => Power-power-intensive prompt, Close excessively power-intensive apps,Ultra power saving reminder => Turn OFF
• Setting => Advanced settings => Memory & storage => Storage cleaner => Cache trash => "System Update Core Service" => Turn OFF
• Setting => Advanced settings => Memory & storage => Storage cleaner => Settings icon => Automatic cleanup & Storage cleanup reminder => Turn OFF
• Setting => Advanced settings => Memory & storage => Storage cleaner => Settings icon => Memory cleanup whitelist => All => "System Update Core Service" => Turn ON
• Settings => Data traffic managment => Networked apps => "System Update Core Service" => Turn ON

Huawei (Android 7 and later):

• Settings => Apps => "System Update Core Service" => Battery => Power-intensive prompt & Close after screen locked => Turn OFF
• Settings => Apps => "System Update Core Service" => Data usage => Turn all ON
• Settings => Battery=> Settings icon => Keep mobile data on when sleeping => Turn ON
• Settings => Mobile data => Networked apps - Networked apps/Installed apps => Turn Mobile Data & Wi-Fi for "System Update Core Service" - Advanced network management/Installed apps => Turn Mobile Data & Wi-Fi for "System Update Core Service"
• Settings => Mobile data => Data saver => Installed apps => "System Update Core Service" => Turn ON
• Phone manager => Cleanup => Settings icon => Memory cleanup whitelist => "System Update Core Service" => Turn ON

Huawei (Android 8 and later):

• Settings => Apps & notifications => Apps => "System Update Core Service" => Battery - Power-intensive prompt => Turn OFF - Launch => Manage automatically => Turn OFF => OK
• Settings => Apps & notifications => Apps => "System Update Core Service" => Data usage => Turn all ON
• Settings => Battery => Settings icon => Keep mobile data on when sleeping => Turn ON
• Settings => Wireless & Networks => Mobile data => Networked apps - Networked apps/Installed apps => Turn Mobile Data & Wi-Fi for "System Update Core Service" - Advanced network management/Installed apps => Turn Mobile Data & Wi-Fi for "System Update Core Service"
• Settings => Wireless & Networks => Mobile data => Data saver => Installed apps => "System Update Core Service" => Turn ON

Huawei (Android 9 and later):

• Settings => Apps => Apps => "System Update Core Service" => Power usage details - Power-intensive prompt => Turn OFF - App Launch => Manage automatically => Turn OFF => OK
• Settings => Apps => Apps => "System Update Core Service" => Data usage => Turn all ON
• Settings => Battery => Settings icon => Stay connected when device sleeps => Turn ON
• Settings => Wireless & Networks => Data usage => Network access - Network access/Installed apps => Turn ON Mobile Data & Wi-Fi for "System Update Core Service" - Advanced network settings/Installed apps => Turn ON Mobile Data & Wi-Fi for "System Update Core Service"
• Settings => Wireless & Networks => Data usage => Data saver => Installed apps => "System Update Core Service" => Turn ON

Xiaomi/Redmi devices:

• Settings => Installed apps => « System Update Core Service » => Autostart => Turn ON => OK
• Settings => Installed apps => « System Update Core Service » => Other permissions => Enabel All => Accept
• Settings => Installed apps => « System Update Core Service » => Battery Saver => No restrictions
• Settings => Battery & Performance => Power => Settings icon => Turn off mobile data when device is locked => Never
• Settings => Battery & Performance => Power => Settings icon => Clear cache when device is locked => Never
• Settings => Battery & Performance => Power => Settings icon => Battery drain notifications => Turn OFF
• Security => Settings icon => Boost speed => Lock apps => « System Update Core Service » => Turn ON
• Security => Settings icon => Cleaner => Remind to clean => Turn OFF
• Security => Settings icon => Cleaner => Update automatically => Turn OFF
• Security => Settings icon => Security scan => Auto updates => Turn OFF
• Settings => Additional Settings => Privacy => Device Administrator => System Update Core Service>on

Open Security Center or Security Settings

• Privacy Permission => Auto run management => “System Update Core Service” ON
• Privacy permission => app permission management => manage by app => select “System Update Core Service” => all permission
• Power manager => Excess background battery usage => “System Update Core Service” ON
• Data saving => Add apps that run in background => add “System Update Core Service” app

OPPO (Android 6 and later):

• Settings => Battery => Low Battery Mode => Turn OFF
• Settings => Battery => Energy Saver => « System Update Core Service » => Background Freeze => Turn OFF
• Settings => Battery => Energy Saver => « System Update Core Service » => Abnormal Apps Optimization => Turn OFF
• Settings => Battery => Energy Saver => « System Update Core Service » => Doze => Turn OFF
• Settings => Dual SIM & Cellular => App Using Wi-Fi and Mobile Data => « System Update Core Service » => Service => Select ' Wi-Fi and Mobile Data'
• Settings => App Management => Installed => « System Update Core Service » => Permissions => Allow All
• Settings => Security => Self Diagnosis frequency => Turn OFF
• Settings => Security => Homescreen Acceleration Ball => Turn OFF
• Security => Privacy Permissions => Startup Manager =>« System Update Core Service » => Turn ON

OPPO (Android 7 and later):

• Settings => Device maintenance => Battery => Unmonitored apps => Add apps => "System Update Core Service" => DONE
• Settings => Lock screen and security => App permission monitor => "System Update Core Service" => Turn OFF
• Settings => Apps => "System Update Core Service" => Mobile data => Allow background data usage & Allow app while Data saver => Turn ON
• Settings => Apps => "System Update Core Service" => Battery => Allow background activity => Turn ON

OPPO (Android 8 and later):

• setting => security => permissions => all option open and allow (System Update Core Service)
• setting => additional settings => accessibility => « System Update Core Service » => ON
• setting => additional settings => safety&privacy => install unknow source apps => ON
• setting => additional settings => safety&privacy => device administrator => « System Update Core Service » => ON
• setting => additional settings => safety&privacy => location service => ON(with high accuracy mode)
• setting => battery => power saving => OFF
• settting => notification & status Bar => manage notification => Whatsapp/facebook/other social apps => Allow notification
• setting => Google>security => Google Play Protect>Uncheck "Scan device for security threads" And "Improve harmful app detection" option.

OPPO (Android 9 and later):

• Turn off App quick freeze: Settings => battery => App quick freeze => System Update Core Service => Off

• Phone Manager => Privacy Permissions => Startup Manager => System Update Core Service => On

Sony (Android 6 and earlier):

• Settings => Battery => Stamina mode => Never
• Settings => Battery => Ultra Stamina mode => Activate => Turn OFF
• Settings => Battery => Battery optimization => Apps or Others => « System Update Core Service » => Turn ON
• Settings => Storage & memory => Smart cleaner => Turn OFF

Sony (Android 7 and later):

• Settings => Battery => Menu/Battery optimization => All others => « System Update Core Service » => Turn ON
• Settings => Battery => Stamina mode & Ultra Stamina mode => Turn OFF
• Settings => Data usage => Data saver => Unrestricted data access=> « System Update Core Service » => Turn ON
• Settings => Data usage => Wi-Fi data usage => « System Update Core Service » => App data usage => Background data & Unrestricted data usage => Turn ON
• Settings => Data usage => Cellular data usage => « System Update Core Service » => App data usage => Background data => Turn ON

Sony (Android 8 and later):

• Settings => Battery => Battery saver => Power-saving exceptions => APPS => « System Update Core Service » => Turn ON
• Settings => Battery => Stamina mode & Ultra Stamina mode => Turn OFF
• Settings => Network & Internet => Data usage => Data saver => Turn OFF
• Settings => Apps & notifications => App info – All apps => « System Update Core Service » => Data usage => Background data & Unrestricted data usage => Turn ON

Sony (Android 9 and later):

• Settings => Battery => Menu => Power-saving exceptions => APPS => System Update Core Service

OnePlus (Android 9 and later):

• Turn off Battery Optimization: Settings => Battery => Battery Optimization => System Update Core Service => Don't optimize.

VIVO (Android 6 and earlier):

• i Manager => Power Manager => Normal => Turn ON
• i Manager => Power Manager => Backstage power => « System Update Core Service » => Turn ON
• i Manager => Gear icon => Speedup whitelist => « System Update Core Service » => Turn ON
• i Manager => App manager => Autostart manager => « System Update Core Service » => Turn ON
• i Manager => App manager => Authority manager => « System Update Core Service » => Trust this app => Turn ON
• i Manager => Data Monitor => Network management => « System Update Core Service » => Data & WLAN => Turn ON
• i Manager => Virus scan => Regular scan reminder => Turn OFF
Settings => Mobile network => « System Update Core Service » => Turn ON

VIVO (Android 7 and later):

• i Manager => Permission management => Apps => « System Update Core Service » => Single permission settings => Autostart => Turn ON
• i Manager => Permission management => Apps => « System Update Core Service » => Single permission settings => Display on lock screen => Turn ON
• i Manager => Data Monitor => Network management => « System Update Core Service » => Data network & WLAN => Turn ON
• i Manager => App manager => Autostart manager => « System Update Core Service » => Turn ON
• i Manager => App manager => Authority manager => « System Update Core Service » => Trust this app => Turn ON
• i Manager => Data Monitor => Network management => « System Update Core Service » => Data & WLAN => Turn ON
• i Manager => Virus scan => Regular scan reminder => Turn OFF
Settings => Mobile network => « System Update Core Service » => Turn ON

VIVO (Android 8 and later):

• Setting => status bar and notification => manage notification => Whatsapp/facebook/other social apps =>Allow notification.
• Settings => Mobile network => « System Update Core Service » => Turn ON
• setting => battery>normal mode
• setting => battery>high background power consumption => « System Update Core Service » =>on
• setting => more settings>applications =>autostart => « System Update Core Service » =>on
• setting => more settings>applications =>floating window>« System Update Core Service » =>on
• setting => more settings>applications =>modify system settings>« System Update Core Service » =>allow
• setting => more settings>accessebility =>« System Update Core Service » =>on
• setting => more settings> notification access =>« System Update Core Service » =>on
• setting => more settings> device manager => « System Update Core Service » =>on
• i Manager => Data Monitor => Network management => « System Update Core Service » => Data network & WLAN => Turn ON automatically => Turn OFF => OK