My, iPhone works again afther the problem in the Title!!!
Thanks alot tonyxu!!
What i did:
1. - Restore to Firmware 2.0 5A240d (5A258f did not work) (if someone needs it just mail me "sayen(at)sayen(dot)ch" )
The restore was successfull. After the restore i allready had my SerialNo. back!!!
2. - Restore to 1.1.4 (1.1.2 did not work)
3. - Used iLiberty+ to Jailbreak, Activate and install BSD and installer
Then my Wifi and everything was back!!
Now i was with Firmware 1.1.4 and Baseband from 2.0 (04.05.01_G)
4. - Set AutoLock to NEVER
5. - In installer add Source
http://installer.iClarified.com
6. - Search for "Baseband Eraser (1.2)" and install it. (This erases the baseband from 2.0)
7. - Restore again to 1.1.4
now you have also the Baseband from 1.1.4!
Now you can use any programm to unlock you iPhone normaly (please not ZiPhone )
Let me know if it worked for you.
I will try maybe allready today on a second iPhone with this Problem.
Best regards
Sayen