*Download ftf file of 16.0.B.2.13
or ftf file of 16.0.B.2.16
(these files are specifically for Sony Xperia C C2305), If you have any other deivce, download their firmware files.
*Install Sony PC Companion
*Switch Off your mobile phone and get the Original USB Cable pf your device
*Open Wmshua and then Connect your device to PC pressing the Volume Down Key
*As Soon as connected Wmshua will install device drivers (taking about a minute), then go to "Flash" option and select the ftf file from there. And click on Start. It will take about 10 minutes or maybe more to flash the file. Wait Till It Completes.
*Now your device is ready on 16.0.B.2.13 or 16.0.B.2.16 whichever you selected
You can also Visit This Link : CLICK HERE
(If you are having problem with the language of wmshua the go to C:\Program Files(X86)\完美刷机 then rename the folder "language" to "language_x" language will become English)