Finally, i tested Pinguino on 18F2455 and 4455. These chips offer the same functions but less memory capacity.
Everything is OK with bootloader V2, but i programmed the chips with 18F4550 checked. If i check 18F4455 on my programer software, nothing works !!
I use a home made JDM programer and IC-PROG with wine.
Maybe it will be useful for other users.........