T-Mobile Update For HD7
"According to AtomicAgeZombie, who tipped us on this, the updates deal with firmware and radio software. The old firmware (2250.09.12001.531) is updated to version 2250.21.30102.531. The old radio version (5.51.09.11a_22.31.50.09U) is updated to the new radio version 5.65.09.25a_188.8.131.52U."
While this is certainly not a major update, T-Mobile HD7 users are reporting an update for firmware and radio software is out and is working. You should be notified automatically about the release, but you can also use your Zune Desktop to check for it.