SM-T235Y Woes

Hey
I bought a Samsung Galaxy Tab 4 (t235y) from frys in the states to use with the t-mobile Smart Choice data plan, which includes roaming in Mexico and Canada

I am able to use the tablet flawlessly in the States, but when I cross over to Canada, at first the tablet would not register with any carrier, and after talking on the phone with Tech Support they were able to get it to register but I am not getting any data. I have tried changing apns, turning roaming off and on, hard resetting and everything.

I read somewhere that tmobile tracks the TAC code to identify that it is a tablet to allow it to access data (weird since it works in the States).

I want to try to put the original firmware of the T235 on the T235y - maybe to see if that would make it work.

My question is if I flash it with the t235 firmware, would it work or brick the unit?

Thanks