What about the label on the back of your radio? Does it say "Ver 2.0" like here:   If not, you have unversioned, or what is called "Ver 1.0" radio. The latest firmware for Ver 2.0 is E613, that's what I run in my radios. The latest for Ver 1.0 is E4B3. I have both firmwares (although I only have 2.0 radios). If you PM me with your email, I can send them to you. So, if I read you posts correctly, you can upload firmware with FPro when turn on the radio with the SCN down, corr