Some people have a problem some don’t. I couldn’t get the firmware to upgrade using TMC in Windows 7. I had no patience to troubleshoot and used an old Windows XP laptop. Don’t know if it works in Windows 10 as I have nothing to upgrade and I’m not messing with downgrading to test. What is the problem exactly and what OS are you using? Do you have access to a Windows XP machine? I can’t help you with Macs.