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How can I update my ZenFone 4 ZE554KL

Star I

Model: ZE554KL

Not rooted

I can't  update my phone to the latest version there's  no button to check for an update tried updating it automatically  but it hasn't notified me that there is obe

My phone is still in android 7.1.1

Please help me 



Please refer to the following method to update the firmware.
Tap "Check Update" in "Settings" -> "System update" to check if the firmware is the latest version.
Note: During the update process, please charge your phone with the AC adaptor or make sure the phone has at least 15% battery power level.

However, if you are unable to update, it is advisable to visit a repair center for further verification.

The following is the contact information: 
Also you can contact the local service center for help.
The following is the contact information: 
Sorry for any inconvenience it may be caused.