New- Download Asus Flash Tool 1.0.0.14 - Latest - [top] -
Firmware Match: Always verify that the firmware model number matches your device exactly (e.g., ZE551ML).
The 1.0.0.14 update remains the most reliable choice for legacy ZenFone users looking to maintain their devices without relying on over-the-air (OTA) updates, which may no longer be active for older models.
Open the tool and click on the "Model" dropdown to select your specific device. Locate your downloaded RAW firmware file by clicking the folder icon. Once the serial number of your device appears in the list with a green light, click "Start" to begin the flashing process. Important Safety Tips ⚠️
Flash Stock ROM: Easily reinstall the factory operating system.