Version 9.1.0.0.50 wasn't even an official beta, FCS, or patch build.
Here are links to a couple interim builds.
ftp://ftp.ruckuswireless.com/downloads/support/7363_9.1.2.0.8.BL7
ftp://ftp.ruckuswireless.com/downloads/support/7363_9.7.0.0.220.BL7
From your AP WebUI, go to Maintenance::Upgrade, and choose the Local
upgrade method. Then, you should be able to browse to the firmware you
downloaded above, one at a time, with a Maintenance::Reboot/Reset reboot
in between. Let us know if this works for you.