Thanks, I think this is what I was looking for!?
I am new at doing iPhone tweaks etc and here is what I got...
iPhone 4 on version 4.1 Unlocked and using StraightTalk for provider.
Bought phone used and it has Cydia, Winterboard etc and originally I used it on ATT and I think it is jail broke.?
I'm trying to upgrade the OS so I can use newer apps yet at the same time not screw my phone up so it doesn't work. (I was told 6.1.2 is latest stable one)
Much appreciated if somebody could tell me if this is the correct (and awesome btw so thanks OP) Tutorial to do what I want or direct me to the one I need.
Cheers!