crwdns2934241:0crwdne2934241:0 derwentx

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It's not easy to see, but the answer is on this page as a comment written by @nalegke, so I thought I'd repost it as an answer.

"Download the JBL Connect mobile app, update speaker's firmware and turn off the alert sounds from the app."

Just confirmed this for myself.

crwdns2915684:0crwdne2915684:0:

open