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How can i manualy update my zenfone zoom from lolipop to marshmallow

Star I
no update on fota still on android 5,thank you

Community Legend II
Hi ranier.delmar
Please follow the guide on the below link and provide me your model name, currently firmware, and preferred firmware for further checking. Thank you.

Thank you mam,this is my phone current data

Community Legend II
Hi ranierdelmar19 
Thank you for your asking. Please refer to the link below
ASUS ZenFone Zoom (ZX551ML) - SupportHave you ever rooted or unlocked your device before, causing FOTA stopped?
You may update "WW" firmware version to the latest Android 5 version then update to Android 6.

#[Zenfone] How to update firmware on my phone?
1. Auto Update (Easier Way)
Settings>System>System update
*Tap the 3 dots on the top row of "System update">Auto-update settings, for related settings
2. Manual Update (Normally be used in cross-Android firmware update or rooted/unlocked device)
Download the firmware file into the root directory, aka the outermost place, of the internal storage>Reboot>Tap the "system update" notification
*To perform cross-Android firmware update, please backup the device data first.