You can't use the MSM tool to flash a ROM. Is strictly for recovery purposes. If your phone is not TMO origin then I would not recommend using this tool.Thanks, really interesting to checkout the CA details. As I read through the comments, I figured I'd go for it (saving a copy of the un-edited file for backup of course). But I'm on 188.8.131.52.IN21AA and apparently it won't work without root. Based on the comments, could NR-SA be enabled via NetworkSignalGuru with root? I have no objection to rooting if it's not a horrible process on this phone. Based on the FCC filing someone posted, it seems like OP will be enabling it via OTA at some point? Could this all be so locked-down due to an FCC requirement?
The root process is pretty easy but you have to do your homework. I was on this forum for months reading everything before I tried to root. Now I go from TMO to global to TMO back to global with ease. I don't even have the updated MSM, I just use the one with 10.5.7 and take the updated. Happy modding!