Unlocking S4 with Android 4.3 on 3 topic

Just got a S4 that's locked to 3 which is also running Android 4.3

I have tried this: [GUIDE] Galaxy S4 Sim-Unlocking - xda-developers, no joy as I fail at point 4 and do not get into the menu

I then tried this: how to access UMTS if you cant access UMTS menu on Galaxy s4 - xda-developers but this also did not work

Someone suggested the main problem is the phone is running 4.3

Baseband number: i9505xxuemk9

Any thoughts or help