actually i'm confused so i want to upgrade my WLC 4402 from 220.127.116.11 to last version available and i have my AP 1242G with version 12.4(21a)JHB1 I just want to know what's the version compatibility beween my WLC and AP,thank you for your helps
I would suggest you go to 18.104.22.168. At least we have big issues with the 22.214.171.124 release and old Intel drivers. Old means older than release 16.7. Also a few Android phones don't seem to like 126.96.36.199, but that is so far not fully proved. Also note that there might be soon an update because of the latest SSL security issues (not the Heartbleed one, the newer one).