Better way to Downgrade Your Zenfone : Read Here
Downgrade Tutorial one of solution if you have brick zenfone. credit to 地球新球长
Zenfone must enter fastboot ( droidboot )
- Download Android Platform tools http://d-h.st/ZN2
- Download Fastboot.img ( T00F T00J T00G) Download button at the top=
Place it at D:\platform-tools - Then ready for an earlier version of the firmware, the inside of fastboot.img extract to the platform-tools (in this tutorial D:\platform-tools).
- placed firmware under the platform-tools ( Do not extract .zip firmware)
- Connect the phone, the phone open to fastboot (droidboot) mode, open a command prompt then type D: and enter then type cd platform-tools then the command prompt characters should be D:\platform-tools
- then type fastboot flash fastboot fastboot.img Enter, wait for command execution finished entering a carriage return after fastboot reboot-bootloader prompt OK, then restart the phone, you can appear a recovery option
- Select the recovery option, the phone reboot to recovery mode, press the volume down button, and then select apply update from adb
- PC command prompt should now D: \ platform-tools \, enter the command adb sideload <firmware name you download before> zip (replace firmware name) Enter
- Patiently wait for the prompt to restart after Complete
