Upgrading WLC (5508) help

[Gonzo1]

Hello,

It's been over a year since I upgraded out 2 x WLCs (active/standby).  They are 2 x 5508's.

These is what we have:

Last time I had to upgrade because we were have client drops and has been very stable since.

1. I believe I just have to upload the latest firmware and the 2 WLC get upgraded then all the AP's automatically?
2. What firmware would you suggest I go to?

Thanks

[Leo Laohoo]

Read the Release Notes (to determine if the APs are supported or not). TAC Recommends the latest 8.5.140.0 to fix the corrupt IOS bug.

[stephendrkw]

You need to be running version 8.3.x in order to upgrade to 8.5.140.0

A new release has been available since 18th April 2019 8.3.150 and if you check Field notice https://www.cisco.com/c/en/us/support/docs/field-notices/703/fn70330.html 8.3.150.0 is excluded from the corrupt IOS bug, however the doc was last updated 18th January 2019.

Personally I would upgrade to 8.3.150.0 then go to 8.5.140.0, it's likely the corrupt AP bug is excluded from 8.3.150.0 this version been released not even a week ago.