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Asus zenfone z00ud cant upgrade system

Star I
hello, im using asus zenfone selfie z00ud, and my android system is 5 i tried to upgrade it to android 6. i did download the firmware and move it into internal storage but the problem is after i reboot and the notificasion pops up after i press "ok" for upgrading instead upgrading it showed me the screen where "reboot" "turn off" "upgrade via sd card" and etc and it didnt upgrading the system, what should i do? is there a way to solve the problem? thank you

Rising Star II
Hi Taufik03 
The upgrade of the firmware must be step by step. It can't upgrade to the Android 6 directly. You have to upgrade one version at a time until the version you need.
[Phone] How to update firmware on my phone? | Official Support | ASUS GlobalThank you.

Rising Star I
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