OHHH I gotcha now. Yeah way back when I tried the same thing, changing a few things in the android-info.txt file. I couldn't get it to work on our Sprint version either. I just went the other route that works. It seems like it is due to our version doesn't not recognize the mainver in that file. I have yet to hboot flash any file on this phone so far. Everything through fastboot or recovery.
Thanks to you!
You change the android-info.txt to match all those attributes, and it works.
I forgot a "6" in the ID section.