I have the same problem, with a iphone here. a corrupt baseband and no wifi and no imei and no bluetooth.
-DFU restores gives me 2003 / 160x / 6 / 1001 errors
It does not matter if i try to use older or newer firmware.
Also tried with ieraser, it says spamming and nothing else.
I can restore to 1.1.4 and kick it out restore mode and jailbreak/activate.
But still no baseband.