Here may be solution for you ..

As you said in your first post

"( i think it is Italy because of this number behind the battery 0574385 )"

it is what creating problem i think (your are guessing it is Italy)

as i mentioned before that i also had same problem when i installed global firmware and i have tried US also in both firmware i got same problem like you(the sim was locked or blocked) but in my case device booted-up

So what i think that you are guessing that it is italy,i think you need right firmware for your device only, i mean each country has different .bin files. You must be using wrong .bin file or firmware. If you don’t know what country your n900 is belong to, you should download all countries firmware and flash with each firmware and try if they work.

Also you are saying that "and when i type *#06# it won’t show the imei." then how did you get firmware files i mean when you download firmware from http://tablets-dev.nokia.com/nokia_N900.php you need to give IMEI.

Also if you tell us the name of firmware you are using we can tell you what country's firmware you are using