I want to downgrade iOS 8.2 from 8.3

Dear Sir/Madam,
iPhone 4s (designed by Apple in california Assembled in China), Serial Number C3*****TD2,
                                16GB 512 MB Ram, CPU Dual-Core 1 GHz Cortex- A9, A5 Chipset.
My name is sutharshan from Colombo Srilanka. Im using Apple iphone 4s. Last week i updated to the latest firmware of iOS 8.3. After that the phone is getting slow & back camera doesnt work. therefore kindly i request a solution for this problem or please tell me how to downgrade to iOS 8.2 from 8.3
Thank You.
<Personal Information Edited by Host>

There is no way to turn back an iOS installation
Restore your iPhone as new and start with a fresh iOS installation using a PC or Mac, if possible.

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