I will make an abbreviation report about my case. My WLC 4402 was running 22.214.171.124 version. There are 18 access point work with local. It's work fine.
To a new project, we will add a access point 1522 and others 1242 to extend the range to a small building using mesh indoor (enterprise mesh).
To make this I read that I need use 5.2 version on WLC. So, I upgrade the WLC (locally) to release 4-2-176-0 and It's work fine (I don't install the new access points yet).
After, I upgrade the WLC to release 5-2-157-0 and install a 5-2-157-0-ER, according to document release. After reboot of new release 5.2, the WLC begin crash and reboot.
I make a downgrade to 4-2-176-0 because my client needed to work, and it's work fine.
In attached is the âtech-supportâ of Controller.
More one information! I too have a WCS that was with release 126.96.36.199 and I upgrade to 5.2.110, before upgrade the controller.
Sorry, because my English is not so good.