I have a Cisco AIR-WLC2006-K9 in my Cisco lab where I work on my Cisco skills, I recently had the need to update the software on my WLAN controller but his is according to the website only available with a service contract. On trying to get a service...

We have a 6509 with etherchannel of 4 trunks going to each 4006 Switch. We recently tested upgrading from CatOS "cat4000.6-3-5.bin" on which everything works to cat4000.k8.8-1-1.bin where we lose 2 of the trunks to each 4006 switch which is upgraded....