Ha! Found part of my answer after searching more through your documentation... planning to upgrade to the recommended ZD3000 9.4.3.0.22 MR Software Release
https://support.ruckuswireless.com/an...
(Excerpt) However, all Zonedirectors support this (zf2942) Access Point till 9.4.3 MR firmware version and is not compatible with any firmware versions beyond this(eg:- 9.5,9.6,etc.,).
With the zf2741 and the zf2942 the last supported firmware is 9.4.2.0.29 - would these WAPs just keep their current firmware while the zf7942 would be updated?