The translation from google is awful, so I am guessing at your question.
If you have firmware 3.55 then you cannot use any form of the USB dongle to run homebrew or to Downgrade.
However with recent developments in the past week or so, you wont need to in time. Sooner or later you will be able to just use your PS3 without the need for the dongle to use homebrew.
I hope that is clear (or translated well)
Make sure you butter the non reflective side of your CD's / DVD's and Blu-Rays so that when you drop them, they land butter side down thus preventing scratches.