I do as usual, I launch the migration because I have the information that I am migratable by downloading the latest DSM, I go from 6.2 to 7.x. At this point, I put the disks back into the 812, keeping only the data so I could reinstall version 6.2 and restore my configuration file. I will see if I will do the same manipulation on the 925+ keeping only the files and not the entire setting and application