FavnetSoft.Com - Below we have provided download link Stock ROM Sony XPERIA Z Ultra C6833 Android Jelly Bean 4.3 (14.2.A.1.136). You can use this file to unroot your device or revert back to a factory setting.
WARNINGFirst of all one important thing - before you start to do anything with your phone, do the backup of your personal data. It is only for your safety in case that something goes wrong or any mistake happens. In that case you can use the backup to restore the data and try to do everything once again.
Download Sony XPERIA Z Ultra C6833 Stock ROM Android 4.3File name: C6833_14.2.A.1.136_CE.ftf
Android version: 4.3 (Jelly Bean)
Firmware version: 14.2.A.1.136
File size: 825 MB