This isn't specific to my laptop as I get the same message on my desktop, and a second laptop. When I try to connect my Galaxy S6 Active to any of them, they see the connection, but I get the Unrecognized USB Device message. I have tried all of the fixes I've found online. Phone is set to MTP. When I connect the phone to the only HP in the house, it sees it, and I'm able to backup files from my phone onto that system. Has anyone found a fix for this problem yet?