After the AP reboots, verify the new version is running by entering: show version Look for the line indicating Cisco IOS Software, ... Version 15.3(3)JF15 Important Safety Note:
Software like PuTTY, Tera Term, or SecureCRT configured to 9600 baud rate, 8 data bits, 1 stop bit, and None parity.
If you have an Autonomous AP with its web interface accessible, this method can be simpler.