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Asus Zenfone Selfie Z00ud Firmware 6.0 1 -

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 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.

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. asus zenfone selfie z00ud firmware 6.0 1

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.

ASUS ZenFone Selfie (model Z00UD / ZD551KL) supports official firmware updates up to Android 6.0.1 Marshmallow

. To upgrade or reinstall this firmware, you must ensure the download matches your device's Regional SKU (e.g., WW for World Wide, TW for Taiwan, or CN for China) to avoid installation failure. Firmware Details for Android 6.0.1 Target OS Version : Android 6.0.1 (Marshmallow). Latest Official Version : Often listed under build numbers such as WW-21.40.0.1999 or similar. Key Changes

: The update removes several pre-installed apps (bloatware) like Mirror, Omlet, and Party Link, while adding standard Marshmallow features such as Doze mode and granular app permissions. Installation Procedure

You can update either automatically via the system menu or manually using a downloaded ZIP file. 1. Automatic Update (FOTA)

Ensure the device is connected to stable Wi-Fi and has at least 60% battery System update Check Update . If available, follow the prompts to download and install. 2. Manual Update (SD Card Method) : Visit the ASUS Download Center

and search for "ZD551KL" to find the correct ZIP file under "BIOS & FIRMWARE". : Copy the ZIP file directly to the root directory

of your phone's internal storage or an SD card (do not place it inside any folders).

: Once copied and the cable is unplugged, a notification saying "System update file detected" should appear in the status bar. Installation

: Tap the notification and follow the on-screen instructions. The phone will reboot to apply the update. ASUS - ZenTalk Critical Precautions

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%. Asus ZenFone Selfie (Z00UD / ZD551KL) officially supports

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:

  1. Download: ASUS ZenFone Selfie ZD551KL – RAW Firmware 6.0.1 (WW_6.0.1_23.40.0.3). A 1.8GB ZIP file from a server that looked like it hadn't been updated since 2007.
  2. Tools: Intel USB drivers for Android. A specific version of ADB. A tiny paperclip.
  3. The Secret Handshake: Open the back cover. Remove the battery. Hold Volume Up. Connect USB to PC. Reinsert battery while holding the button. Pray.

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. The notification arrived on a Tuesday, thin as

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 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

Q2: Will this firmware lock my bootloader?

No, it will not relock an unlocked bootloader. But to flash official OTAs later, you need a locked bootloader.

3.1 Hardware Utilization

🔧 Firmware Details

Key Features and Improvements in Firmware 6.0.1

Upgrading from Android 5.0 (Lollipop) to ASUS ZenFone Selfie Z00UD firmware 6.0.1 brings tangible benefits: