try to save all the files from your Dreambox 500 @ /var/tuxbox/config/enigma specially the "config" file (inside the motor settings, etc) and copy these files to your dreambox 7025.
After copy files do a Hard reset that the configs will loaded correctly and not overwrite the old settings again. Best way is when you switch off the Power from box with 1/0 or power cable.
After that it must be work.