Hello there. :)
The best way I would recommend is to flash stock firmware.
To flash stock firmware. You will need the following.
A. Flast tool.
B. The firmware you want. (preferably 1.14 firmware)
C. Usb cable.
Follow the steps below.
Download the Flash tool.(links provided).
Download the Firmware, Stock FTF links provided.
Install the Flash tool and the drivers for your device.
Install fastbook and flashboot drivers too.
Click the thunder symbol.
Choose Flash mode.
Browse to choose the firmware you downloaded.
Power off your phone and connect your phone to the computer via USB while holding the power down button.
The phone will be flashed.
Once it is done, You will have your phone in factory settings.
Feel free to customize it.
Hit the thanks button if i helped.
Device Xperia L, UB,rooted,STOCK 4.2.2 (1.14) <Custom Modded! >
Any man that doesn't learn to laugh at rejection is worthless as a man.
NVIDIA tegra note 7 <Custom Modded LB/Unrooted>
Device history - X8,XU,XL,TN7