This method is for ASUS Zenfone C /Z007/ZC451CG Only.|
- Get your Zenfone C to boot into fastboot mode (Power button + Volume down)
- Connect Zenfone C to your PC and install USB drivers if not done already. The phone should show up as an "ASUS Android Composite ADB Interface" in the Device Manager.
- Now, open ASUS Flash Tool :- ASUS Flash tool v220.127.116.11 It should detect your phone with serial number and blue orb in front of it.
- Select your phone model i.e. ZC451CG Choose if you want to wipe data or not.
- Click box icon and browse for the signed zip image file you downloaded earlier.
- Select your device on the ASUS flash Tool by clicking on the serial number
- Select the device on the ASUS Flash Tool Click on the green start button, be patient, stay calm and cross your fingers. This could take 10-20minutes or so.