When planning an upgrade, start at the version you want to end up on, and review the
Release Notes, ie. 188.8.131.52.163 (GA).https://support.ruckuswireless.com/documents/939-smartzone-3-2-1-0-163-mr-release-notes
Page 21-21 has Upgrade Path, and says you can upgrade from 184.108.40.206.667 (MR4).
But we did not publish/post a build .663 which you are inquiring about. Where did you
get the firmware running on your SCG(?).