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yes there is, I had to do the same thing, downgrade a controller running 4.2 back to 4.1.191, lost all of the config information on the controller, had to rebuild it from scratch.
I am running 4.1.171.0 on my WLC4402s and 4.1.83.0 on WCS. Been up for about a month on each and no problems, I have a mix of older 1230's 1242's and 1510 mesh on the network, 60 access points. I like 4.1.83.0 on the WCS tons better, reporting, s...
I was able to, it was more involved than most, you need to upgrade the IOS to 12.3.7, and replace the radio with a newer B/G. once those two items are down, run the upgrade utility, cut and paste the mac and created Key to your WLC and your up
