Meta Description: Looking for the official ASUS ZenFone Selfie Z00UD firmware 6.0.1? This guide covers download links, step-by-step installation, Android Marshmallow features, and fixes for common upgrade errors.
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
, 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 Asus ZenFone Selfie (Z00UD / ZD551KL) Go to product viewer dialog for this item.
received its official update to Android 6.0.1 Marshmallow starting in July 2016. This firmware, typically identified by build number 21.40.0.1692, represents the final major platform transition for the device, moving it from Android Lollipop to Marshmallow. Key Features and Changes
The transition to Android 6.0.1 introduced standard Marshmallow refinements and significant changes to the pre-loaded ASUS ZenUI software:
System Refinements: Introduced Doze Mode for improved battery standby, granular App Permissions for better privacy control, and new Emojis.
Bloatware Removal: The update notably removed several pre-installed "bloatware" apps to free up internal storage, including ASUS Backup, Mirror, Remote Link, PC Link, and SnapView.
Default App Shift: Legacy apps like ASUS Email, ASUS Calendar, and ASUS Messaging were replaced by Google's versions (Gmail, Google Calendar, Google Messenger) after a factory reset.
Camera & Gestures: Added Motion Gestures and a new Pano Sphere Mode for the camera. asus zenfone selfie z00ud firmware 6.0 1
APP2SD Limitation: A critical change is that APP2SD is no longer supported in Android 6.0. Users must move apps to internal storage before upgrading to avoid data loss. Installation Methods
Users can update their firmware through the following methods, provided by ASUS Support:
The Asus ZenFone Selfie (Z00UD/ZD551KL) Go to product viewer dialog for this item.
update to Android 6.0.1 Marshmallow is widely considered a essential upgrade for performance, primarily because it removes a massive amount of "bloatware" that plagued the original Lollipop version. 🚀 Performance & Software
The shift to firmware version 21.40.0.1692 (or later) significantly cleans up the user interface.
Bloatware Removal: Asus removed over 20 pre-installed apps, including Mirror, Omlet, Party Link, and PC Link, freeing up internal storage and system RAM.
System Fluidity: Users report the Snapdragon 615 processor runs "smoothly like butter" after the update, effectively resolving the sluggishness seen on older firmware.
Marshmallow Features: Adds Doze Mode for better standby battery, Google Now on Tap, and granular App Permissions. 📸 Camera Experience
The hardware remains the standout feature, but the software update improves the processing of its dual 13MP cameras.
Selfie Quality: High-resolution 13MP front shots with a dual-tone flash remain excellent for its class.
Autofocus: The rear laser autofocus provides 0.2-second focus speeds, though some users find the camera rattles slightly due to its physical design.
Drawback: Fancy photo-processing modes (like HDR or Super Resolution) can still be slow/sluggish even on 6.0.1. 🔋 Battery & Hardware Asus Zenfone Selfie ZD551KL - User opinions and reviews
The notification arrived on a Tuesday, thin as a whisper: “System Update: Android 6.0.1 (Marshmallow) – 1.21 GB.”
Lena stared at her ASUS ZenFone Selfie’s screen. The phone, a lavender-gray brick with a charmingly ridiculous 13-megapixel front camera, had been her loyal companion for two years. It had survived a drop into a bowl of ramen broth and a winter stuck on Android 5.0 Lollipop. Lollipop was reliable—clunky, battery-hungry, but reliable.
But this update, labeled WW_6.0.1_23.40.0.3_20170112, promised change. “Do you want to install?” it asked.
She tapped “Yes.”
The phone rebooted. The ASUS logo glowed. Then, the little green android appeared, belly-up, with a spinning blue wireframe globe on its chest. The progress bar crawled. 10%. 30%. 50%. Lena made tea. 80%. She checked Instagram on her laptop. 99%.
Then, silence.
The screen went black. Not the “off” black—the void black. A tiny red LED blinked near the earpiece, like a dying heartbeat.
“No. No, no, no,” she whispered.
She pressed the power button. Nothing. Power + Volume Up. Nothing. She plugged it in. The LED glowed solid red for a moment, then returned to its slow, desperate blink. Her Selfie was a brick. A pretty lavender-gray paperweight.
Three hours of frantic Googling later, she found them: the ghosts of XDA Developers.
A thread titled "[GUIDE] Unbrick Z00UD – Raw Firmware Flash (6.0.1)" was her only hope. The instructions were a ritual of desperation:
At 2:00 AM, her laptop screen flickered. Device Manager refreshed. A new device appeared: "Cloverview Plus" with a yellow exclamation mark.
She had entered the DNX mode—the phone's deepest emergency bootloader. A place most users never see.
The command line was her language now. She typed:
> fastboot flash boot boot.img
> fastboot flash system system.img
> fastboot flash recovery recovery.img
Each command felt like defusing a bomb. The phone's tiny red LED would flash faster with every successful write. Finally, the last line:
> fastboot reboot
The screen glowed. The ASUS logo returned, but it was sharper, cleaner. Then, the new setup wizard appeared—Android 6.0.1 Marshmallow, with its fresh "M" logo and simplified icons.
The first thing Lena noticed was Doze. The battery graph was a gentle slope, not a cliff. The second was App Permissions—no more flashlight apps asking for her contacts. The third, and most personal, was the Selfie Master app. The front camera’s 13MP sensor, now optimized for Marshmallow, captured skin tones that actually looked like skin.
She took a deep breath. The phone, once dead, was reborn. Meta Description: Looking for the official ASUS ZenFone
That night, she wrote a new post on XDA: “Fixed my Z00UD. Don’t give up on your Selfie. Marshmallow is worth the nightmare.”
Her phone didn't just have new firmware. It had a second life.
The End.
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
: 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? Have you updated your ZenFone Selfie to Marshmallow
ASUS refined its ZenUI launcher, reduced bloatware, and improved the camera’s low-light performance.
Note: ASUS officially stopped supporting the Z00UD after Android 6.0.1. There is no official Android 7.0 (Nougat) or later for this model.