Reinstall the official ASUS USB drivers and try changing the USB port on your PC (prefer USB 2.0 ports over USB 3.0).
Ensure your phone is charged to at least 15% (ideally over 50%) or keep it plugged into its original AC wall adapter during the installation process.
If you are still having issues with the flashing process, check your firmware version under and verify it with the files available on the ASUS official support site. To give you the best steps to proceed, could you tell me: What is your current firmware version? (e.g., WW-1.15.xx)
If the OTA update does not appear, you can manually trigger it using the official firmware file from the ASUS Support Website . : Search for " asus zenfone selfie z00ud firmware 6.0 1
: Tap the notification and follow the on-screen instructions. The phone will reboot to apply the update. ASUS - ZenTalk Critical Precautions
The Asus ZenFone Selfie (ZD551KL / Z00UD) remains a classic device valued for its unique front-facing camera capabilities. Upgrading or reinstalling the official Android 6.0.1 Marshmallow firmware can resolve performance issues, fix software loops, and restore your device to peak operating condition.
Long-pressing the home button triggers contextual actions based on what’s on your screen. Reinstall the official ASUS USB drivers and try
It is crucial to back up your personal data (photos, contacts, app data, etc.) before performing any manual firmware update or flash. Flashing the stock firmware will typically wipe all data from the device.
Flashing firmware can wipe all user data. Backup your contacts, photos, and files to an SD card or computer.
Clears deep-system viruses, adware, or corrupted temporary system caches. To give you the best steps to proceed,
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.
If you haven't received an Over-the-Air (OTA) notification, you can update manually: