Upgrade OS from android version 4.4.2 to 5.0 or later versions

[Sarnadeep]

My Zenfone is not working properly. It is getting really slow and now whatsapp has stopped working as it will run only on 5.0 or later versions. I am not able to upgrade the OS using system update . Please help.

[Falcon_ASUS]

@Sarnadeep
May I know the full model of the phone you are using?
[Phone] How to find and recognize the ZenFone model name?
If you are unable to update, it is advisable to visit a repair center for further verification.
The following is the contact information:
https://www.asus.com/support/service-center-location
Also you can contact the local service center for help.
The following is the contact information:
https://www.asus.com/support/CallUs#
Sorry for any inconvenience it may be caused.