As spotted in Pocket PC Thoughts, it seems that HP has released the much awaited h5400 Series WLAN Firmware Update that allows the iPAQ h5400 Series running Pocket PC 2002 to connect to an 802.11g Access Point.
The update is supposed to add LEAP authentication client support and enables the iPAQ h5400 Series to connect with a WLAN Access Point that supports both 802.11b and 802.11g.
The update readme files clearly states that the ROM update v1.11.xx must be installed first before the WLAN firmware update is installed. DO NOT install the WLAN firmware update before installing ROM update v1.11.xx.
Related Links : [Download Firmware]