help with Linksys BEFW11S4

Nest year at school, i am planning on setting up my own encrypted wireless network in my dorm room, because the campus's network's range is horrible. I have an old Linksys BEFW11S4 from our old home network before we got FIOS installed in our home. Last year at school, i did try to hook it up, but i made the stupid mistake of changing the password to access the router in the first place. I was wondering if there is a way that i can reset it back to its factory settings. I tried to call Linksys about it, but they said the model is too old, and they would have to charge me for the support call. Can anyone give me some insight on this? And also, i would like to encrypt it as well, can someone tell me how to do that as well? Thanks!