your general information, the first two digits represent the actual
software release - called Major and Minor numbers. The third digit in ZD
code is the maintenance release and you should always use the highest
maintenance release (ie 9.12.3 is the third maintenance release) which
will have the most fixes for that version of code. Also check if there
are newer "refresh" where often fixes were added to the maintenance
release. Typically the site will only have the latest refresh version
but it is good to check.
important point. The ZD will only let you upgrade to a newer version
if you have a valid support contract on the ZD serial number. If you
have a support contract in our system (found on he support site under
liman) the ZD should check this automatically and allow upgrade. If not
you need to contact your sales representative to purchase support. If
you have purchased support but it is not being "seen" by the ZD, please
open an administration case with Ruckus Support who will help you out.
These details can be found in our Knowledge Base Articles: