Default what happens when you unlock?

Hey guys my SGH-T337m from work was on rogers and we recently changed carriers to telus..

so they provided us with unlock codes...

so does the firmware change to telus?

troubleshooting is with telus now??

and since my update my wifi does not turn on..i have tried all the tricks of battery pull wipe and reset...

only thing left is a patch i seen put not sure what to use now for