How to manually update Asus Zenfone 2 to official Android Marshmallow?

Asus Zenfone 2 official Android Marshmallow Update

Asus released Android Marshmallow update rather late (in August, 2016) for it’s last year’s flagship Zenfone 2. Unfortunately the update roll-out was very erratic, so much so that majority of Zenfone 2 users around the world are still to get it OTA. As a solution Asus uploaded the System update as a zip file. So if you have a Zenfone 2 still running Lollipop then this post is for you. Here is a step by step guide to upgrade your phone to official Android Marshmallow

Zenfone 2 Marshmallow

Step by step guide to manually update Asus Zenfone 2 to Android 6.0 Marshmallow

Warning – Before the update make sure –
1. Check that you have the phone model ZE551ML (Z00A) or ZE550ML (Z008) Indian variants – as we have the download links for these two only. For other countries you may check Asus Smartphone’s official facebook pages for that region

2. Phone must have sufficient space (atleast 5-7 GB free memory) for update process to run smoothly. So check for the available memory and free it up if required before updating the phone.

3. Backup your important data before updating the phone. Although the update process is not supposed to delete the user data in the phone but you never know what may go wrong during the process. So as a precaution it is recommended to take backup of your data.
3. Phone’s battery must be charged to 60% or above. As the update process will take time (about 15-20 minutes) – battery must not die out during the process. Because if it does, your phone might become irreparable. So charge the phone sufficiently before starting the update process.

Update process – ready to go?

  • Download the Zenfone 2 Marshmallow update zip file from links given below (according to your phone model)
    Zenfone 2 ZE551ML
    Zenfone 2 ZE550ML
    Update file is about 1.8 GB in size – you can download it via computer or in the phone itself.
  • If the file was downloaded in computer then transfer it to phone memory – copy the file to root (outside of all folders) of phone memory
    If the file was downloaded in the phone itself then place it in the root of the phone memory – by default files are downloaded in “Download” folder in the phone – you can copy the file from there to the root via phone’s (or any other) File manager
  • Now restart the phone – it will detect the file and a notification will appear at startup saying “System update file detected” – tap it and follow the instructions – phone will reboot and the update process will start

Wait for the process to complete – if everything goes well your phone will boot into an all new Android Marshmallow. After the update, phone system will take some time to stabilize – so do not worry about initial glitches. Our Zenfone 2 unit is now way more faster and better after the update. One striking change we noticed is the display brightness – it is really very bright now then it was earlier. Do share your experiences here after the update.

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