GT-I8190N

I have a Samsung Galaxy S3 Mini (GT-I8190n) and it is running Android 4.1.2, I am with Vodafone in the UK. I am fine with this but I have one question. My friend, also with Vodafone just got the same phone as me (GT-I8190n) but his phone in on 4.2.2, I have looked everywhere and cannot find why...

Before I start this thread is about the GT-I8190N Version of the phone not the GT-I8190, GT-I8190l or GT-I8190t version. Hello I am having an issue with my phone. What happened was is i rooted my phone with a root file and ODIN and it was working until i got errors saying 'unfortunately...