I've been doing a few experiments with Spotpass and this is what I've found. Probably not new information to most people, but some helpful tips: 1. Spotpass is bound to the system it was first installed in. A system format will invalidate the Spotpass data saved on the SD card. (Needless to say, Spotpass data cannot be shared between different systems) 2. The only way I've found to force the 3DS to check for Spotpass data has been to change the date of the system. 3. Changing the date of the system will not allow you to get Spotpass data from a previous date. (obviously) Something I haven't tried yet is if Spotpass data is shared between multiple save files (i.e. Samurai Warrior Chronicles) or if it is still valid after save data erasure.