Download ZenFone 2 4.21.40.134 Marshmallow Firmware [ZE551ML]

Download ZenFone 2 4.21.40.134 Marshmallow Firmware [ZE551ML]

Asus has published the much-awaited Marshmallow update, version 4.21.40.134, for ZenFone 2 (ZE551ML) handsets carrying WW SKU. You can download the full update package of this build using the direct download link provided below.

Firmware Details

• Device: Asus ZenFone 2 (Z00AD/Z00ADA/Z00ADB/Z00ADC)
• Model: ZE551ML
• Android: v6.0.x Marshmallow
• Firmware: 4.21.40.134
• Previous Version: 2.20.40.195
• Release Date: 31.08.2016
• SKU: WW
• Region: Global
• Type: Full firmware package
• Status: Official
• File Name: UL-Z00A-WW-4.21.40.134-user.zip

Download Link: Official Mirror | Size: 1.19 GB

Installation Instructions: After downloading the update package copy it to the internal memory of your phone and wait for an update notification to arrive. Tap the notification and confirm the installation of the new update.

In order to downgrade back to Lollipop you need to install this package provided by Asus through the same procedure mentioned above.

Stay tuned!