Unbanning yourself in Infantry Online is a simple thing to do.

Two things must be done to successfully unban yourself. First you need to change your "Volume Serial Number"

To do that, you need to use my tool I wrote: MultiPlayer Game Hacking toolkit. Download it, start it. Go into "Tools" and select "Volume Serial Number Changer". It displays your current serial and under it has an input box where you change your serial. Change it, then restart your computer as required.

Next step, is to delete the MSDOS.bin. To do that you can also use my tool. Simply goto the "C:\"