How to Downgrade Zenfone 5 from KitKat toJellyBean

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Tools needed :

1.    Intel USB Driver for Android (Download Here)

       http://www.mediafire.com/download/m7692ps1wm5poli/intelandroiddrvsetup1.1.5.zip

2.    ADB Fastboot Tool (Download Here)

       http://www.mediafire.com/download/9u0gpex28d4u1do/ASUS+ADB-platform-tools.zip

3.    Recovery Image Zenfone 5

       (https://www.asuswebstorage.com/navigate/s/644D9E0A19714899974C75FC4B6C87EDY

4.    Download 4.3 Jellybean Firmware Zenfone 5

        http://www.asus.com/Phones/ZenFone_5_A500CG/HelpDesk_Download

       Select-> Other > Firmware>

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Instructions:

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•   Install Intel USB Driver and Extract ADB Fastboot Tool
•   Copy Recovery Image to ADB Folder
•   Extract downloaded 4.3 Jellybean Firmware and Copy to ADB Folder
•   Turn On USB Debugging (Tutorial Here:  http://www.asus.com/zentalk/forum.php?mod=viewthread&tid=5590&page=1&extra=#pid22824)
•   Connect Zenfone with USB Cable to Computer/PC
•   OpenADB Folder and Open Command Prompt (Shift + right Click > Open Command Here)
•   Type: adb  reboot-bootloader
•    It will reboot the phone in bootloader/droidboot mode and enter fastbootType: fastboot flash recovery file.img (file.img = adjust thefilename,   recovery       image that you download earlier)
•   Then go to ADB: choose Recovery when android Belly up icon appears press volume down + volume up and Choose update from ADB
•   Type adb sideload file.zip (file.zip = adjust the filename, asus zenfonefirmware that you download earlier), and wait until complete
•    Do a Factory Reset and Wipe Partition cache.
•    Reboot.