managed to reset the lock code with the file from the first post on this thread, thanks to qwerty12.

Here is the step by step of what have I done.
1. download the a.out file from the first post of this thread + Give Thanks! to qwerty12.
2. copy the a.out file to the root folder of your phone.
3. open xterm and gain root via sudo gainroot.
4. cp /home/user/MyDocs/a.out /home/user/
5. chmod 777 a.out (give permissions to write)
6. run-standalone.sh ./a.out (pops up that security code reset to 12345)
7. rm a.out (hopefully you dont need it anymore)

I know that this is kind of lame solution and I'm sure that this can be done in a more sophisticated way, but I am a noob to the N900/Unix thingie. Anyway thanks again qwerty12.