“My JBL Boombox 3, turns on for 3 seconds then turns off? On my Samsung A20, the bluetooth says, JBL Charge 3, so I assume it's your 3rd model. My JBL Boombox is brand new and fully charged. I tried pushing the bluetooth and -volume holding for 15 seconds”
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We do not have a JBL Boombox 3 yet. You might have the JBL Charge 3 instead which is different from the JBL Boombox Series.
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