internet buy NV dvd not working

i got a new dvd for my prius nav
buth now its not working
maybe i have got one for the gen5 nav system?
can not send it back

maybe i can do a selfmade dvd with the file's from my old gen4 5.1 disc en combine them with the newer files from the gen5 7.1 disc?

only i see that the files on the new dvd are smaller in size?

 

i put in the new dvd and it started to load the new firmware i gues?
there was a message tellling me that i must not turnoff power while its doing that.

after there is a message "map data incorrect" etc

so..

put in the older dvd and it worked.. only one's i got a messaga clean dvd because can not read dvd message.. buth not sure if thats because of the firmware upgrade or not?

anyone now howe to make this work?
maybe the new dvd is compressed data map files and therefor can not read it
the older dvd is bigger in map data file's