I've done the following:
Downgraded to MDC, Rooted w/ SACS and followed this guide partially http://forum.xda-developers.com/show....php?t=2530610
Awesome, wifi didnt work though. Someone told me to follow THIS guide http://forum.xda-developers.com/show....php?t=2601443 because I had KNOX bootloader, so I basically updated to MK2.
No more SACS or ROOTed system, but Tmobile still works... awesome.
Now data..... I am trying desperately to get this to work but having a **** ton of troubles. I cannot use the *#0011# method at all and the original guide says to use prop editor and add a line, but the thread doesn't explain it well. I am going to google it now but wanted to make a thread to see if anyone else has had this issue.
Please and Thank you -