The specific firmware version for the ZenFone Selfie Marshmallow update is often identified as 21.40.0.1692 Automatic Update
Confirm: Tap the notification and follow the on-screen prompts. The phone will reboot and begin the installation. Method 2: Recovery Mode (Sideload) asus zenfone selfie z00ud firmware 6.0 1
Each command felt like defusing a bomb. The phone's tiny red LED would flash faster with every successful write. Finally, the last line: The specific firmware version for the ZenFone Selfie
> fastboot flash boot boot.img > fastboot flash system system.img > fastboot flash recovery recovery.img the last line: >