Download Asus ZenFone Max Full firmware with VoLTE Support (WW 8939-13.8.26.80)
In the below guide we will provide all the required information for updating your Zenfone Max (ZC550KL) to the latest version manually. Still based on Android Marshmallow, the new update includes VoLTE, update for several apps, fixes bugs and supports SOS call for India.
Important: The below guide is for Zenfone Max ZC550KL and SKU WW. Do not install the firmware on other SKU (CN, TW, etc.). Check it by going to
Settings > About > software information > Build number and see the software version for WW, CN, JP, etc.
Note: Backup all data you have on the phone before proceeding, as the update process will delete data.
Manually Update ZenFone Max latest version
Disclaimer: Follow the instruction at your own risk. We will not be liable if any damage occurs to your device and/or its components.
Step 1: Download stock firmware
zip file for ZenFone Max (version 13.8.26.80) from
Download and save the zip file on your phone’s internal storage.
Step 2: Software update notification will pop up on your Zenfone screen. Just tap to update.
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If the above method does not helped, you may try the recovery method described below]
1. Copy and paste the
downloaded firmware zip in to the SD card of the phone
2. Boot your phone into recovery mode by pressing and holding Power & Volume Up buttons after switching off the phone.
3. In recovery, select Apply update from sd card, select the firmware zip file.
4. Once the installation process finished, reboot your phone.
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