Rename the file if necessary to match the standard ASUS naming convention (e.g., UL-ASUS_Z00UD-WW-21.40.0.XXX-user.zip ).
Flashing stock firmware carries inherent risks if prep work is skipped. Ensure you complete these tasks:
: Users report that the device runs "smoothly like butter" on 6.0.1, with improved RAM management and a faster overall feel compared to previous versions. Enhanced Camera Features
To install Android 6.0.1 Marshmallow, you must gather the correct software packages. asus zenfone selfie z00ud firmware 6.0 1
This usually happens if you downloaded the wrong SKU. Redownload the correct SKU and try again. Phone Stuck in Bootloop:
Asus Zenfone Selfie (ZD551KL / Z00UD) Firmware 6.0.1 Marshmallow Update Guide
or a computer. Flashing firmware can sometimes lead to data loss. Keep your Zenfone Selfie Rename the file if necessary to match the
: The Marshmallow update significantly reduced pre-loaded software. Apps like ASUS Backup, Mirror, Remote Link, Party Link, and Omlet were removed to free up internal storage.
Users report the Snapdragon 615 processor runs "smoothly like butter" after the update, effectively resolving the sluggishness seen on older firmware.
Select "Apply update from ADB" or "Apply update from microSD." Enhanced Camera Features To install Android 6
The standard firmware package for the Android 6.0 Marshmallow update on the ZenFone Selfie
If the Z00UD is stuck on the ASUS logo after a failed firmware update (common with 6.0 transitions), the device usually requires a forced "SD Card Update" via recovery mode (Volume Up + Power). If recovery is corrupted, a raw firmware flash via an ASUS service tool (or ADB/Fastboot if the bootloader was previously unlocked) is the only recourse.
The Android 6.0.1 Marshmallow update for the ASUS ZenFone Selfie (Z00UD) brings several enhancements and new features, including:
If your PC fails to recognize the device in ADB mode, open Windows Device Manager, find the device with a yellow exclamation mark, right-click, and manually update the driver using the downloaded Asus USB Driver folder.
Fixes bootloops, frequent app crashes, and random restarts.
