It keeps saying that the scanner is not detected. I using the same cable that works great for my TRX 1 . I have downloaded the driver from the whister website. I have tried holding down the menu button when connecting the USB cable.
These things can be finicky from personal experience. If it doesn't connect, what will work is remove the sd card with scanner off.
Put the sd card in one of those sd card adapters, put that in your computer and I can pretty much guarantee it will update that way. Then once done put it back in the radio.