Во первых, никто меня еще не имел
Sorry guys, je parle Francais comme la vache du provance.
I hate to say this, but I'm afraid I can't help. There's a certain commitment I'm bound to. Besides, I've never had Flanker2.51 and I have no idea where I could get its Western version. All I've seen here in Moscow is localized Russian ver., and I'm not sure if it's compatible with yours.
I can give you a clue, however. In previouos versions (the last one I dizassembled was 2.03) the airplane code of Su39 was 26(hex). Codes for Su27 and Su33 were 03 and 04 respectively. So, you may want to try to seek for 'cmp al,26' and see what's going on next to this.
Take care, though. Recently, we had one Russian guy arrested by FBI for breaching Adobe's .pdf format. So, I personally wouldn't find it advisable to advertise any hacking activities.