I had not a backup, so I flashed the stock rom 4.1.2 (N7000XXLT5_N7000OXXLT2_EUR).
It stucked at the logo SAMSUNG. Then I open the recovery (was still there) and made a wipe all data,after reboot it worked!
Now it's ok with sim card and shows the IMEI 004999010640000, which is different from...