Those of you that have already upgraded your radios already know this, but newcomers are often stumped by the fact that you MUST press the second yes button on the 2nd disclaimer screen as a press and hold, NOT just a simple press. Dave's you-tube video missed this as well.
Also for those of you that don't know when you unmount and then remove the SD card you simply press in and release the card and it will pop out a little bit from the slot on the radio and then you can pull it out. In most PC slots you don't have this mechanism, you just push it in part way until it bottoms out, and then you go thru the "safely eject" thing on your pc then just pull it out. You would be surprised by the simple things that stop success for first timers. Even the right click, copy paste, operation stops a lot of people..