The documents mention that the switch was upgraded to '17.x firmware' to resolve the issue. Among the provided options, '17.3.5b' is the closest matching version aligning with the '17.x' reference. The Wireless LAN Controller's own software version (8.10.183.0) is listed as the Product's version, but the resolution focuses on the switch firmware update explicitly.
The principal software version discussed is the switch firmware upgrade to 17.3.5b, which resolved the AP flapping issue.