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Frequent Contributor II

Unable to select 802.11a!

Hi, running two 2400 on frimware 2.5.5.4 and using AP61s. When I go into a site, and go to the General page and select a, save, then go back its gone back to g! It does'nt seem to stick. I have one site running a and have changed this many time but its stopped working. We did have a firmware update a few months ago, could it be that???
Thanks.