Backup Support: Options to retain user data during specific flash types.
Battery Level: Keep your phone charged to at least 50% before starting.
Firmware Match: Always verify that the firmware model number matches your device exactly (e.g., ZE551ML). NEW- Download Asus Flash Tool 1.0.0.14 - Latest -
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 ⚠️ Backup Support: Options to retain user data during
Original Cable: Use the original ASUS USB cable to prevent connection drops during the write process.
Clean Install: Remove all bugs by performing a fresh firmware flash. Once the serial number of your device appears
Unbrick Devices: Fix devices stuck in boot loops or on the logo.
Data Backup: Flashing usually wipes all internal storage; back up your photos and contacts first.