Before installing, verify SHA256 (example):
$ sha256sum air-ap2800-k9-me-8-5-182-0.tar
Compare with Cisco’s published value on the download page. Air-ap2800-k9-me-8-5-182-0.tar
If writing an academic/technical paper about this image, you could structure as: Compare with Cisco’s published value on the download page
The most common reason to download AIR-AP2800-K9-ME-8-5-182-0.tar is to convert a regular lightweight AP (which normally needs a controller) into a Mobility Express controller. the AP reboots
Once written, the AP reboots, and you can access the Mobility Express GUI at https://<AP-IP-address> with credentials admin/Cisco. From there, you can onboard additional APs.
Warning: This process erases the previous lightweight image and reformats the flash. Do not interrupt power during the TAR extraction.
Key note:
MEmeans this AP can act as a controller for up to 25 other APs (in 8.5 release) without a physical WLC.