open tm contol centre click on update
Click on the serial tab, then set your comport to whatever you comport is, if it’s a usb to seriel it will probably be com3
Select the file button and navigate to the image you downloaded
turn the power off from switch at back of tm 600
there is a button on front of the tm ^ hold this down and turn back on your tm and you should see a setup screen
keep pressing the up button and you will see serial update. Now press the right button > and hit ok, your box should start a flash now, wait till its finished and power off and on again.