It should be fine. Whatever you had before you retain. If you didn't have full link you won't get it with a normal firmware update. If you have it now, you retain it. The only reported issues is where people have paid for custom performance screens from retrofitters then they loose them in a firmware update. The T at the end means they are unmodified original.
You might find SD card better than USB. Normal Fat32.
You might find SD card better than USB. Normal Fat32.