Hello Kgosi,
When planning an upgrade, start at the version you want to end up on, and review the
Release Notes, ie. 3.2.1.0.163 (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 3.0.4.0.667 (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(?).