I downloaded all the files necessary for the update, and completed installation.
I certainly fully - charged uboom L.
I opened the upgrade tool and tried to connect the uboom l device, but nothing happened.
The tool application can't detect any device .
I tried with several usb 3.0 data cables, and other usb ports. I even tried with my desktop pc and notebook.
It's not working on both computers.
I don't know how to solve this problem.