Zastai> Thanks for very useful info..

Actually, I will need gadgets for dumping BIOS, I have to run burnt CD with BIOS dumper somehow. Or with ps2link to run/dump over ethernet. So I'll have to buy SM for this reason.
Swapmagic yes, the gadgets no. The BIOS Dumper ISO is provided as a convenience for those with modded consoles. All you really need is the .ELF file (also available in the downloads section - the BIN version instead of the ISO version) on a USB stick - you do need a second USB stick as target because the dumper won't write to the stick it's running from.
Procedure (assumes swapmagic; may require the Coder version):
1) Get 2 USB sticks (only need about 15MB free)
2) On one stick, create a folder called "SWAPMAGIC"
3) Put the BIOS Dumper ELF file in that folder under the name "SWAPMAGIC.ELF"
4) Put both sticks in your PS2, put the SwapMagic CD or DVD in the drive, and turn it on
5) Swapmagic should automatically run the BIOS dumper, and the results should be put on the second stick
6) When the dumper is done, you can turn off the PS2 and removes sticks and disc
7) All done, and no modding needed, just the Swapmagic disc.
Note: Depending on USB sticks and/or Swapmagic version, it _may_ be possible to dump onto the same stick the elf is on - the procedure stays the same, except you don't put a second stick in the PS2 at step 4.