AT&T S4 unlocked LTE on T-Mobile?

[tony1208]

I just switched over to tmo with my unlocked att gs4 and i can not get the hotspot to work... tmo service said its because its a att cell and not all features work...walk around??

 

[Tim Frentz]

see my notes at freeHelpingHands.wordpress dot com

 

[praegler]

I have an unlocked AT&T Galaxsy S4. I am on T-mobile and the phone works, but I either get 4g-LTE or Edge. I did the research and found that the AWS Bands that T-Mobile uses for it's HSPA (3G) are disabled on the SGH-I337 AT&T S4. A little more searching and I found the web site: How to Enable T-Mobile HSPA+ AWS Bands on AT&T Galaxy S4 SGH-i337/SGH-i337M! | GalaxyS4Root.com

I have followed the instruction on the site (with the exception that I had to use *#0808# instead of *#7284#), but when I get to the the part where you recover the 337_AWS.qcn, I get the error "Received an invalid command from the phone"

Has anyone else gotten this error when trying to enable the AWS Bands on your AT&T phone and how did you get past the error?