If you have Cisco Prime Infrastructure this can be easily done. If not, and you can create scripts that simply reboot the AP in the CLI and schedule the scripts accordingly to your requirement.
However rebooting the AP’s is probably no the solution you should be looking for, but rather moving them from your Primary WLC to your Secondary WLC. In a typical N+1 HA solution (Non SSO) you can upgrade your Secondary WLC and reload it. You can then migrate your AP’s across from the Primary WLC to the Secondary accordingly to the prefferred schedule you like, once the AP join the secondary WLC it will update and then reboot after the update and associate to the secondary WLC. You can repeat this process until all your AP’s are migrated, then upgrade your Primarty WLC, reboot to activate software image and migrate all the AP’s back to your Primary.
If you have an HA SSO solution or just one WLC you won’t have this luxury, the 1040 series is a low spec AP and you will have issues with using the pre-download feature with the newer software code to minimize downtime.
Bottom line, when the AP initiate the download from the WLC it will reload automatically after the upgrade.
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