I have seen some software that used the file timestamp as a version number. In fact it might of been on some Pioneer upgrades. So it could indeed be an issue - except that nezfotnemom said he used the copied SD to upgrade his other AVIC.
I'm guessing nezfotnemom installed the file before compressing them. Again, I haven't had a chance to do any analysis of the files but noticed the timestamps changed for the folders when the files were uncompressed.
