Well, I am stuck at step 1--> at this BBS1,2,3(.dat) area
I can decrpyt it by using the dnas decrypter(I dont know whether is correct or not, it take less than 5 sec on black screen), I always ended up getting all BBS1,2,3_DEC.dat with 0 byte as i check, there should be at least one with 25 MB...