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Welcome to the Sonos Community! And, apologies for the delay.
I’m sorry to hear of the issue you are having in trying to update your Roam SL. Are you still having this issue? If so, do you get a specific error message when trying to update?
It may help to reboot your router, speaker and/or your phone/tablet.
I hope this helps.
"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein