[Q] galaxy s3 i747m 4.1.2 to 4.3 topic

hello, :)

I have a Galaxy S3 i747m Version 4.1.2, and I want the past to version 4.3. :)

when I try to do the parameter from the phone I get a message that displays "your device has been changed. upgrades, software updates are no longer available" :(


how I can do it from the computer? and what do I need to download as an application? :confused:


excuse me for my English is google who translated :D