Hope you are doing well!
I can recommend you to go to do it local first
Go to Admin & Services > Administer > Upgrade > select local > upload the image
If this does not work for you, I recommend doing it by tftp, it is quite simple please refer to this link:https://support.ruckuswireless.com/articles/000001551
fw set host <TFTP server IP address>
fw set proto tftp
fw set port 69
fw set control <image file name>
For AP:fw set proto tftp
fw set host 192.168.0.10
fw set control 188.8.131.52.1363.bl7
I hope you find it useful!