Hi Ladislav,

Check out these notes;

The TFTP server must support file transfers larger than 32 MB. Version 3.0 or later of Tftpd32 is recommended. If your TFTP server software does not support file transfers larger than 32 MB, then the upgrade does not complete (see the Troubleshoot section for symptoms). Note that several popular TFTP server software packages do not support file transfers larger than 32 MB.

http://tftpd32.jounin.net/tftpd32_download.html

Wireless LAN Controller (WLC) Software Upgrade

http://www.cisco.com/en/US/customer/tech/tk722/tk809/technologies_configuration_example09186a00805f381f.shtml

This is detailed nicely by John in this thread;

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless%20-%20Mobility&topic=Security%20and%20Network%20Management&topicID=.ee6e8c0&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.1ddf8255/0#selected_message

Hope this helps!

Rob

PS: Don't forget to post these in the Wireless Forums :)