Thank you for all your answers!

Here you have a few additional information and answers about your comments:
1. @aspergerguy
a. I've already flashed the first device and the problem persist. "Unable to use this SIM card in device"
b. On the second device the flasher won't recognize the phone (probably just the storage of the phone)

2. @hardy_magnus
a. Already tried to flsh them, still the same issues

3. @endsormeans
a. A lot of persons got the n900 and others because it was nokia, but they only got these terminals by that simple reason. This guy had 2 of them because several years ago he and his brother made that choice, use them for a couple years and then put them in a drawer. When I saw them he gave them to me for free!
b. Already tried to flsh them, still the same issues

Is there any other thing to do besides re-fhash them?

Regards.