I have updated the radio before years ago. I was wondering what was the fixes they fixed or add something? I haven't update the radio yet since I haven't found what they updated.
Whoops... I thought you were asking something different. I haven't been able to find the release notes either. But I know they must exist somewhere, because every time I post about a new update, someone will respond with what the update fixes, but so far, they're not telling me where to find this information. From everything I've read there is suppose to be a button on that Update Screen called "Release Notes", but it doesn't show on my screen and it looks like it's not showing for you either.
I can tell you that the DSP Firmware 1.3, along with the CPU Firmware 1.8 and above will allow the scanner to decode a Project 25 Phase II TDMA system. And the Library update (which comes out every Saturday) updates the SD card with the latest information from the Radio Reference Database. That's about all I know.
Hope this helps.