Can someone help me decipher this code?

XTvbKTz5jHDvRFavN2+318u+ErrRKIgqO2i7Sez+4o3SlomPAx/4SX5dLdCEHrkK\\

my friend sent this to me for no reason and ask me to decipher it for 20 bucks, and I don't really know how to decipher.

also, please explain what you did to decipher this