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How to update Asus ZenFone 2 (ZE551ML) to Marshmallow

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Asus released manual update to Marshmallow for Asus ZenFone 2 (ZE551ML) last year.  They released the second update last month.  I don’t think OTA will be available soon.  I decided to give it a try and hopefully the second update makes it more stable.

1: Check your phone have latest lollipop update. If not, please update it.
Setting > About > System Update > Check Update
2: Go to URL: https://www.asus.com/us/Phone/ZenFone_2_ZE551ML/HelpDesk_Download/
3: Please select OS > Android
4: Click Firmware.  I have Worldwide version and there are two updates available.
WW-4.21.40.223(andriod M) – 1.18GB
WW-4.21.40.184(andriod M) – 1.19GB
I don’t know if update is incremental or not. Therefore, I downloaded the first update: WW-4.21.40.184(andriod M) – 1.19GB.
5: Back up your phone data and settings with your favorite backup program. In my case, I used Wondershare Mobile Trans.
6: Use a USB cable to connect your phone to your computer.
7: Copy downloaded update (UL-Z00A-WW-4.21.40.184-user.zip) to the root of your phone.
8: A “System Update File Detected” notification should appear. Tap the notification and select the correct update package.
9: Make sure your battery is above 70% or is charging.
10: Once the update is done, the device should restart by itself. Optimization of apps will take time depending on how many apps are installed on your phone.
11: Check for update and it should tell WW-4.21.40.223 is available to download
Setting > About > System Update > Check Update
12: Download and install WW-4.21.40.223 update.
13: Enjoy Android 6.0.1 Marshmallow.

Note: It pops out a message to ask me remove then add gmail account back to enable protection when I click settings. I followed instructions and enabled protection again.

Here are issues I encountered so far.
1. Google Chrome can’t load any URLs. I have to uninstall and reinstall Chrome to make it work.
2. When I listen “Our Daily Bread” with Dolphin browser in background, there is lag but I don’t have this issue with Chrome browser.



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