Devo 10 not detected by upgrade/install tools

Hi,
I'm upgrading from Deviation 3 to 5. My desktop is running Windows 7 64 bit. I have installed the Walkera drivers and also tried with the Deviation drivers, but both tools will not detect my transmitter!

I removed all USB devices.....except my mouse and keyboard, re-started the computer, but no luck.

The transmitter does go into USB mode, and I can access its file system on the desktop, consistently.

Please help!

USB Mode is accessed holding ENT key during power-up of your TX. DFUse Mode is accessed holding EXT key. Is that what you do ?

@Khan
Thanks! I was not doing that.....have now upgraded to Deviation 5. Do I need to transfer some files from the Deviation 5 folder to the file system on the transmitter? I know I have to ensure the tx.ini and hardware.ini files, and the model folder should not be overwritten. What about the log.bin file and errors file in the Deviation 5 unzipped folder...do these need to be copied to the transmitter file system?