The firmware comes in a compressed file (i.e. ZIP or RAR). Unzip/rar the file, and you should have a .bin and .cue file. You burn the .CUE file to CD-R (using Nero) and then put it in the PS2. When it boots, you have 2 options - Flash Chip and Install BMAN. Firstly, select Flash Chip. You will now be able to boot backups. Then, insert a memory card, and choose 'Install BMAN' (if you want) and this will make the PS2 boot up into the very cool chip OS.
