I just loaded mine (A1) with 1.22NA, will keep you posted. Saved my configuration, did a factory reset, loaded the new firmware and then reloaded my configuration. No problems at all loading it, status says 1.22NA, 2010/01/19. I didn't really have any problems with 1.21NA, only thing it did was drop my wireless a few times a week. Other than that it ran well.