- Make sure that the time and date on the controller are current.
#clock set hh:mm:ss <day of the month> <month Jan to Dec> < Valid 4 digit year 1993-2035>
#clock set 16:14:00 16 may 2017
- Download a fresh copy of the firmware image
- Upgrade from CLI instead of GUI through an SSH (secure shell) or console port connection using FTP
Detailed instructions on upgrading from FTP. TFTP or USB: How to upgrade a WiNG controller or AP from CLI