alright.
my card on the back says:
P/N: LA-4137-1020-GP-WW
and my axim x5 details are the same as yours.
under start/settings/systems/remove programs you find it listed as SYMBOL CENET_SPECTRUM24
i have 2 files, can't remember which one i used. tried to upload it here as an attachment but one of the file is bigger than 2mb so no luck here.
download them from here:
4shared.com - online file sharing and storage - download MC&DriverOnlyInstallers_Symbol_CF_wi-fi.zip
4shared.com - online file sharing and storage - download spectrum24driver_0.3.4_arm.ipk
let us know if they work. if i remember this right, i think i used the one inside the ZIP file that is not the driver only. try them all.