I have an existing 4404 setup that I need to migrate all the AP’s over to a new 5508 setup. I also need zero downtime in my setup. I purchased two new 5508 controllers that I will join to the mobility group, move the ap’s, and then setup in a master/slave setup.
The two 5508 came with IOS 7.2.103 while the 4404 is on 7.0.116. I have downloaded, multiple times the 7.0.116 code and tried to apply on the 5508 without success. I keep getting a signature failure followed by the “TFTP Failure while storing in Flash!” message.
Troubleshooting so far:
Tried both controllers
Tried downloading the IOS again, on different computers.
Used TFTP program from SolarWinds and tftpd32
Tried different cables, different ports. Tried from GUI and CLI both.