I have an Airport Extreme Base Station and an Airport Express, which had been working well for over a year. I recently (foolishly?) upgraded the Express to 7.5.2 and now it's very erratic - there's usually a connection but the speed is frequently very slow. I haven't upgraded the Airport Extreme yet, and so I'm wondering what to do: (i) upgrade the Extreme on the theory that it's the difference in versions that's causing the problems; or (ii) downgrade the Express back to 7.4.2; or (iii) fiddle around with resetting the Express. Having read (too late) about problems with 7.5.2 I'd really like to go with door #2, but I can't find a link to download the firmware anywhere. So I would appreciate suggestions, and if the recommendation is for the downgrade route, a link to an actual download site (Apple shows only the 7.5.2 version). Thanks!