Asus Zenfone Selfie Z00ud Firmware 6.0 1 ✓
Despite the upgrade, several legacy issues persisted or were introduced:
The official firmware for the Z00UD typically followed the versioning convention Z00UD-WW-xx.x.x.xxx.
As the device is branded "Zenfone Selfie," the camera firmware was the focal point of the update.
ASUS ZenFone Selfie Z00UD – Android 6.0.1 Marshmallow Firmware Guide
If you’re still rocking the ASUS ZenFone Selfie (ZD551KL, codename Z00UD) and looking for the official Android 6.0.1 Marshmallow firmware, here’s what you need to know.
One of the most critical features for a "Selfie" oriented device (which generates large media files) was Adoptable Storage. This firmware allowed users to format external MicroSD cards as internal storage.
Long-pressing the home button triggers contextual actions based on what’s on your screen.
If you can’t find the original ZIP, check ASUS’s old firmware page (using Wayback Machine) or ask in ZenFone groups. Always verify MD5 checksums.
Have you updated your ZenFone Selfie to Marshmallow? Share your experience below! 👇
Asus ZenFone Selfie (Z00UD / ZD551KL) officially supports Android 6.0.1 Marshmallow asus zenfone selfie z00ud firmware 6.0 1
, which was released as a major update to its original Android 5.0 Lollipop firmware. This update introduces several performance improvements and clears significant storage by removing pre-loaded "bloatware" apps. Firmware Overview Model Number: Z00UD (also known as ZD551KL). OS Version: Android 6.0.1 Marshmallow. Notable Build:
WW_V21.40.0.1854 is one of the verified official Marshmallow OTA builds. Key Changes: App Removal:
Removes apps like ASUS Backup, Google Play Books/Games/Newsstand, and ZenFlash to free up internal memory. New Integrations:
Adds Google Calendar and Google Messenger as default services. Efficiency:
Includes the "Doze" power-saving feature to extend battery life. How to Update to 6.0.1
There are two primary methods to install the 6.0.1 firmware:
The official Android 6.0.1 (Marshmallow) firmware for the Asus ZenFone Selfie (ZD551KL / Z00UD) was released to provide essential system optimizations and new features like Google Now on Tap and Doze mode. This version is widely considered the final major official update for this model. Firmware Details Version Number: 21.40.0.1692 File Size: Approximately 1.63 GB Key Changes:
Bloatware Removal: ASUS removed over 20 pre-loaded apps, including ASUS Backup, Mirror, and Remote Link, to free up storage.
New Features: Includes Pano Sphere Mode for the camera and motion gestures. Despite the upgrade, several legacy issues persisted or
App2SD Support: Note that the APP2SD feature is not supported in Marshmallow; you must move apps from your SD card to internal storage before updating. How to Install (Manual Update)
If you haven't received an Over-the-Air (OTA) notification, you can update manually:
Download: Visit the ASUS Download Center and enter ZD551KL. Select "Driver & Utility," then choose "Android" as the OS to find the BIOS & FIRMWARE section.
Transfer: Connect your phone to a PC and copy the downloaded .zip file into the root directory of your phone's internal storage (do not put it in any folder).
Trigger: Unplug the USB cable and reboot the device. A "System update file detected" notification should appear in the status bar.
Confirm: Tap the notification and follow the prompts to begin the installation. Ensure your battery is at least 60% charged before starting.
Warning: Manual updates should be done step-by-step; you cannot jump directly from older Android versions (like 5.0) to 6.0 without following the incremental firmware versions listed on the official support site.
The official Android 6.0.1 (Marshmallow) firmware for the ASUS ZenFone Selfie (model Z00UD / ZD551KL)
is the final major update officially supported for this device. Firmware Details Model Compatibility : ZenFone Selfie ZD551KL (Z00UD). : Android 6.0.1 Marshmallow. SKU Matching Have you updated your ZenFone Selfie to Marshmallow
: Updates must match the device's SKU (e.g., WW, CN, JP). Installing a different SKU may lead to permanent device failure. Official Availability
: While Over-the-Air (OTA) updates were standard, manual downloads are often required for older devices through the ASUS Download Center Update Methods 1. Over-the-Air (OTA) Update Settings > About > System update Check Update Requirements
: Stable Wi-Fi and at least 60% battery life are recommended before starting. 2. Manual Update (Internal Storage) Preparation : Download the correct firmware file from the official ASUS Support site Installation file in the root directory of the phone's internal storage (not inside any folder).
Reboot the phone. A "System update file detected" notification should appear in the status bar.
Tap the notification and follow the on-screen prompts to install. 3. Manual Update (SD Card/Recovery Mode)
: Place the firmware file on a microSD card. Reboot the phone into Recovery Mode and select Apply update from SD card Optimization
: After installation, the device will restart and optimize apps, which may take several minutes. Important Precautions Step-by-Step Upgrading
: You cannot jump directly from older versions to 6.0.1; you must install intermediate versions sequentially. Backup Data
: System upgrades can cause data loss. Always back up your important information before proceeding. Recovery Tools
: If an error occurs during the transition from Android 5.0 (Lollipop), specific recovery tools or flashing a standalone recovery file may be necessary. Do you need help identifying your SKU
(e.g., WW or CN) to find the exact download link for your device?