If you can't find a ZD with FW 9 or higher to have it upgrade the AP there are things you can try. First try changing the FTP server. I think you've got the fwupdate.ruckuswireless.com server there. Change that to fwupdate1.ruckuswireless.com (notice the 1)
If that doesn't work. I'd suggest you download the FW from the RW page, start a TFTP server on your LAN and upgrade it that way. You'll need a control file. I don't know exactly how these look like for ZoneFlex but if you go by how MediaFlex controll file looked like it would be something like below.
[rcks_fw.main]
192.168.0.125
zf7363_9.7.0.0.220.Bl7
7061504
[rcks_fw.bkup]
same as above
First you specified the TFTP servers address
then the name of the file to be uploaded
then the size of the file in bits
Save that in a fwcntrl7363.rcks file or similar. I've never updated a ZF AP this was, but I guess it should work.