There are two easy ways to fix this for you.
The first way is already identified - update the new Z30 to be anything at all higher than the Q series you had before.
The second way is a tiny bit trickier but not that hard: There is a file in your backup which can be edited to be something "less" than what you have on the Z30. Backups are normally stored on your PC as "My Documents\BlackBerry\Backup" and they end with .bbb
The file is called "manifest.xml".
You can easily open a BlackBerry backup file with 7Zip (
7-Zip ) and edit the text file to make it a smaller number than the current operating system on your phone. Save the changes and then re-open the backup as you tried to do already.
Hope that helps!