Hello, my soundsport wireless headphones will not power on. Yesterday I updated the firmware to the latest version. I left them to charge overnight, plugged into a wall outlet via USB cable. The LED was green this morning while still plugged into the outlet, but once I removed them from the USB cable and pressed the power button, no LED at all was illuminated. Also, I am unsure where on the headphones the serial number is located. I no longer have the original packaging. Looking forward to hearing from you, as I did enjoy using these headphones, and Bose usually is a reliable brand. Thank you.
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