i have a dual-band time capsule and the only firmware is:
I've restored it numerous times with no succession.
I use to get internet drop outs and stalling of the internal drive , etc.
now i can not get full internet speed.
directly to the modem i get ~25Mbps Down & ~3Mbps Up
with the timecapsule i get ~2Mbps Down & 1Mbps Up
with the Airport Extreme (with firmware 7.4.1) i was getting modem speeds.
randomly i'll get modem speeds with the timecapsule (when i first set it up).
there are no a/b/g devices connected nor any other interference or anything connected to it than just my macbookpro.
its been a very just doesnt work type of set up
🙄 and i was really looking to just swap it out without issue.
hopefully this will be fixed asap as its seems its been an issue for well over a month and half.