I changed the password in plain text (search xep2 and change that in a hex editor), and then used IDA to change JZ to JMP before the "compress id/pw" message. I couldn't get much more into it because of "Segmentation Fault (core dumped)".
Anyone have any clue? Obviously it's because I told the server to "gtfo if you're gonna decompress the id/passwd," but anything...?