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As long as you clear the memory, you should have enough room to upload 4mb to the Access Points. I have done it here. I ust find it easier to use a TFTP server to do the upgrade.
A lot depends on what you have around the area too. I am running 19 AIr 1200's here, and I had a problem with the RF Signal going through certain things. The pattern for the antennas varies with what kind you have. I am using the 6DBI Omni Directi...
What I have here at my place of work, is 19 Air 1200. I also have 5 remote sites that I have at least 10 air 1200's running at the other sites as well. I do use WLSE to manage everything. Also on the Air 1200's I use IP Phones, everything here see...
The best way I have found to do the upgrade is using TFTP. Just put the IP Address of the TFTP server, then browse to the file and it should take off for you.