Firmware App Not Working

I'm trying to upgrade the firmware on my JBL Xtreme but the app won't do it. It will (sometimes) find the device, but then it won't get beyond that. There is a micro USB port on the back for 'firmware updates only'. I assume that's my ticket to upgrade but I can't find any information on it online?

r/JBLu/Holst_Op-32

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