Default [Q] Password Rejected After Upgraded Firmware

Hi Guys,

I need your help.
I have updated/upgraded my Z ultra to Android 4.3 via PC Companion.

After the upgrading process finished, it booted and request my password to decrypt

The problem is it reject my password. so, It cannot load the system.

FYI, I always encrypt my phones, and I have no problems with my other phones when upgraded the firmware.

Is there anyway to solve this problem? or if I have to factory reset or reinstall, how to do it? as I understand Z Ultra has no stock recovery.

Thanks in advance
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