Asus has released the official 4.21.40.74 Android 6.0 Marshmallow update for its ZenFone Zoom (ZX551ML) via OTA. You can download the full update package of this firmware here.
Firmware Details
- Device: Asus ZenFone Zoom (Z00A)
- Model: ZX551ML
- Android: v6.0 Marshmallow
- Firmware:Â 4.21.40.74
- Previous Build:Â 2.26.40.108
- Region: Global
- SKU: WW
- Release Date: 1.07.2016
- Status: Official
- Type: Full OTA Package
- File Name:Â UL-Z00A-WW-4.21.40.74-user.zip
Download Link: Official Mirror (Asus) | Size: 1.15 GB
Update Instructions
- Download the firmware package from above to your PC (don’t extract it).
- Transfer it to the main directory of your phone’s internal storage.
- Monitor the progress of the transfer and disconnect the USB cable upon completion.
- An update notification will appear in the notification bar.
- Tap the notification and then follow on-screen instructions to complete the upgrade.
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