When the links were first published for 5.1, I flashed and installed the update through fast-boot and I am currently on 5.1 successfully. I have a t-mobile sim and I purchased this device from them. Today, they are pushing the 5.1 update which is the same as what I already have, but in addition, they are adding VolLTE. Now Im not sure if I already have that due to previously flashing it, or am I supposed to re-flash the T-Mobile variant of 5.1. Anyone have any input?
xda-developers