ThinkPad 802.11a/b/g Mini-PCI Adapter may not work after updating BIOS - ThinkPad R50, R50e, R51, T40/p, T41/p, T42/p, X31

Symptom
If an ThinkPad 802.11a/b/g Mini-PCI Adapter is installed, when the BIOS is at certain versions, the wireless adapter is unable to connect to any Access Point. The user may also observe:

Affected configuration
Any of the following ThinkPad systems with an ThinkPad 802.11a/b/g Mini-PCI card installed, may experience this symptom:

Solution
There are 2 Solutions available.

Additional Information
The failure is caused by a problem between the wireless driver and the system BIOS versions listed below. The BIOS is being updated to correct the problem, and future BIOS releases will not display this problem.

The following BIOS levels may display the error:

The wireless driver development team has confirmed this failure. If the latest version of Access Connections and the wireless driver are loaded, this failure will not occur. However, if the factory preload image is recovered while the effected BIOS is on the system, the old driver will be loaded and the system will again experience the failure.

All BIOS releases are included on the BIOS Update page for each system from the device driver download matrix.
Drivers and software - ThinkPad

Click the correct system, and then Under the "BIOS" section click the link to the latest BIOS level release.