Zenfone 5 Firmware Downgrade -

You must use firmware that matches your device's SKU (e.g., WW for Worldwide, CN for China). Mixing SKUs will cause failure. Method 1: Using MicroSD Card (Recommended for ZE620KL)

Once complete, select "Wipe data/factory reset" , then "Wipe cache partition" , and finally "Reboot system now" . Method 2: ADB Sideload (For Older Zenfone 5 Models) Zenfone 5 Firmware Downgrade

Type adb sideload [filename].zip (where [filename] is the name of your downloaded firmware). You must use firmware that matches your device's SKU (e

Install ASUS Android Drivers and ADB tools on your PC. WW for Worldwide

Hold simultaneously. Release when the phone vibrates. Flash Firmware: