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I use sonos at my martial arts club to play music during fitness classes etc..

the issue is the router sonos is connected to doesn't have internet connection and when I go on my iPod/iPhone to use the sonos app it tells me to update, I can't update without being connected to that specific router and I can't access internet in order to get the update. How can I update on other devices without being connected to it?
You should not have updated the sonos app on your phone...oops

You could ask sonos support to reverse the update on your phone, not sure how likely that is.

Or take all the sonos speakers to somewhere with internet and upgrade them, then take them back.
The controller on the phone probably auto-updated. Many people leave the app store to auto-update.