First thing to do is install Filezilla installed and setup a user called meru with a password meru to a shared folder where the update file is stored.
Backing up your saved configuration to offbox (remote location)
First copy the running config as some backup file by using the below command
copy running-config backupconfig
Then copy the backupconfig file out off the box
copy backupconfig <a href="ftp://meru:meru@offbox-ipaddress/backupconfig">ftp://meru:meru@offbox-ipaddress/backupconfig</a> .
Next copy the update to the Meru controller, change the file name to match your firmware.
copy ftp://meru:meru@offbox-ipaddress/meru-5.1-93-MC3200-rpm.tar .
Once the file uploaded you can check its uploaded correctly, you may see more updates than just the running and the version you are on.
To start the firmware you need to disable the AP auto upgrade feature temporally
configure terminal auto-ap-upgrade disable exit
Now to start the upgrade
upgrade system xxxx
where xxxx is the name of the new firmware code to which the controller has to be upgraded you can get this from the Show Flash command
It will update the AP’s first and then once they are rebooting it will update the controller and restart. Normally allow 1 hour to perform this work. You sometimes have to upload the firmware in steps to get to the latest version.
Now turn AP auto upgrade back on
configure terminal auto-ap-upgrade enable exit