We are going to upgrade a couple of v5210 in the near future , attached are approx 400 AP's ( for example AP3825i ) to each controller.
After the upgrade I understand the AP's when reconnecting will look for a software update from the new code .
My question is how long will my AP's be in a unstable state as not all 400 will get upgraded at one time ..
What is the best way to upgrade the AP's ..