okay ADB was successful, however my phone was acting up and kept rebooting. I reflashed the at&t modem with Odin. I flashed the t mobile modem again through ADB successfully with the same results. I reflashed the at&t modem again through Odin. then I tried the method that kc720 used in post #15 with the same results. Now I'm back on the default at&t modem again. I am using an active t mobile sim card. If I can get the t mobile modem to stick I can then dial *#2263# and attempt to use the wcdma 1700 band that does show up with my t mobile sim card though when I try to use it with the at&t modem I just get the circle with the line through it where my bars should be. Hope this helps. I really want the 1700 frequency to work and ready to try something else
Sent rom my SAMSUNG-SGH-I717 using xda premium
I don't have T-mo so I can't help much, just saw the thread and figured I would help you out with partition permissions, so I'm bowing out now. Thanks for trying stuff though, this is the kind of thing that makes android awesome.