hm...
Sim issues on the 1st n900 ...let us deal with later...

I have a few thoughts...

I think perhaps the 2nd n900 may have an issue related to a cssu testing version..

I would suggest reading here
https://talk.maemo.org/showthread.ph...ternal+storage
as well refer to the cssu testing thread as well..

It is possible that the previous user mucked about with a testing variant ...
Possibly the issue has had some deeper effect...that simply reflashing will not fix...
the cssu testing thread and internal storage issues are a good place to start.

Although you're reflashing should (one would figure..) wipe it all clean and fresh...



hmmmm....

open terminal and execute this :

ls /dev/mmcblk0*

and tell me what happens...
(God only knows what your n900 will spit out in response... )