How to fix no-wifi baseband problem on 3.0?

My wifi has just gone off for no reason and a complete retore to 3.0 in itunes and redsn0w has not fixed it. Its greyed out and i found a tool called ibooter that would tell me if my baseband nvram was corrupt but it dosent seem to work on 3.0

Could someone please tell me what tools i can use to check for and/or fix a faulty baseband causing the 'no wifi' problem.

Many thanks in advance.

Just been using iRecovery and is this radio nvram dump normal, the second line?

Type: 0x0004 Size: 0x0014 Purpose: Build Name - "J57421YZSVKTB"
Type: 0x0007 Size: 0x0004 Purpose: Not Avaliable
Type: 0x0001 Size: 0x01f4 Purpose: WIFI Calibration Data (crc 126218919)
Type: 0x0002 Size: 0x0006 Purpose: WIFI Hardware Address (xx:xx:xx:xx:xx:9d)

Type: 0x0003 Size: 0x0006 Purpose: BT Hardware Address (xx:xx:xx:xx:xx:9c)
Type: 0x0005 Size: 0x0006 Purpose: Ethernet Hardware Address (xx:xx:xx:xx:xx:9e)