Sure you can, provided the BBM project wasn’t corrupted in the process. So if your current project is still intact in the BBM, you start off by deleting all of the files on your SD card. Empty the Recycle Bin or Empty Trash. Note, I said “delete”—so DO NOT format the card. If the BBM project is good, then use the BBM File > Export Project to SD card and when done, accept the prompt for future synchronization.
If successful, follow Goran Rista’s instructions in the file that accompanies the Legend drum set.
However, if your BBM project is corrupt, there are a couple of helpful posts on this forum. “General Disaster Recovery” and the other deals with integrating Premium Library or Default Content Update v2: Adding Premium Content Full Library via BBM