Crucial Warning: Check your phone model under Settings -> About Phone -> Model number. Do not confuse this phone with the ZenFone Max Pro (M1) (ASUS_X00T), which uses different hardware. Only install ASUS_X00P firmware on this device.
Download Firmware for ASUS ZenFone Max (M1)
ZB556KL (ASUS_X00P) (WW (Worldwide / Global)) Latest official maintenance release for the ASUS ZenFone Max (M1) model ZB556KL. Recommended for system recovery and restoring factory software.
Not sure this is the right one for you? The full list below covers every build.
Compatibility & Bootloader Notes
Official ASUS update packages (UL-*.zip) flash through stock recovery without unlocking the bootloader. You can install them directly from internal storage or a microSD card.
Preparation checklist for ASUS ZenFone Max (M1)
- Check your phone model in Settings -> About Phone -> Model number.
- Confirm your filename matches your model (ZB555KL or ZB556KL).
- Charge your battery to at least 40% before flashing.
- Copy the ZIP file to the root of a microSD card if your phone cannot boot into Android.
- Back up personal files if the device is still accessible.
Flashing Instructions
Step-by-step flashing instructions for ASUS ZenFone Max (M1) are on FlashGuideHub's ASUS Flash Tool guide.
Also flashable via ADB Sideload: Open ADB Sideload Guide →
Frequently Asked Questions
Download the WW-15.00.2007.122 user package. It is the final and most stable official update released for model ZB556KL.
Download the WW-15.00.1905.101 package. It contains the official factory images for model ZB555KL.
Copy the ZIP file to a microSD card. Insert the card into your phone. Turn the phone off, hold Volume Down + Power until recovery mode opens, and select "Apply update from microSD".