I am installing a 4402 WLC next week and I am trying to determine which IOS version I should install. I see that there are many options to choose from. My pass experiences from talking with Cisco Reps that 5.0 is not good and 4.2 is the safest; but I see now that there has been a 5.1, 5.2, and 6.0 release since the last time I have had to upgrade or install a WLC.
I have read the release notes on 4.2.205, 5.2.193, and 22.214.171.124 and nothing seems to jump out at mean in the Caveats that makes me say one is better than the other. So, if anyone can tell me what's best or have any arguments against a particular version I'd appreciate it.
This is a new install with 30 APs.
126.96.36.199 is the latest main deployment version of code with the AssureWave accreditation i.e the most tested and stable currently available. I have implemented this code with no issues so far. I would advise only upgrading to 5/6 code if there are any specific features in that release you require for your deployment. Most 5 codes have various bugs and 6 is geared more towards the 5500 WLC at present.
Hope this helps.