Cisco Cisco Aironet 350 Wireless LAN Client Adapter

To minimize the risk of a power failure during the firmware flashing process, which could render your 
client adapter inoperable, Cisco recommends that your computer be plugged into AC power or have a 
fully charged battery at the start of flashing. If a power failure does occur, follow the instructions in the 

 section to contact TAC for assistance.

This section describes how to upgrade to client adapter firmware version 5.20.17 on a computer running 
Windows 98, 98 SE, NT, 2000, Me, or XP.

Refer to the Cisco Aironet Wireless LAN Client Adapters Installation and Configuration Guide for 
Windows CE (version OL-1375-03) for instructions on upgrading the firmware on a Windows CE device. 
This document is at the following URL: 

To find the firmware version that your client adapter is currently using, open ACU and click the Status 
icon. The Firmware Version field on the Status screen shows the firmware version.

Follow the steps below to upgrade your client adapter’s firmware to version 5.20.17.

When you upgrade your client adapter’s firmware using ACU, the Automatically Load New Firmware 
When NDIS Driver Is Updated parameter on the Aironet Client Utility Preferences screen becomes 
disabled (or unchecked) automatically to prevent the newly loaded firmware from being overwritten by 
the driver. If you ever want to enable this parameter, you must recheck the check box.

Use the computer’s web browser to access the following URL:

Select Option #2: Aironet Wireless Software Display Tables.

You can download software from the Software Selector tool instead of the display tables. To do 
so, select Option #1: Aironet Wireless Software Selector, follow the instructions on the 
screen, and go to 

Select Cisco Aironet Wireless LAN Client Adapters.

Under Individual Files, find the client adapter firmware.

Click the link that corresponds to your client adapter’s model number (such as 340 or 350 series).