Zenfone 5 JellyBean Instructions: ---- 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 ...