Environment : This article applies to all 7200 series controller running AOS version 6.2 and being upgraded to AOS version 6.3.
You are most likely going to encounter this error message “Content Length exceed limit” while upgrading your 7200 series controller from OS version 6.2 to 6.3 through the local file upgrade option on the controller WebUI.
As of the release of 18.104.22.168, this a known upgrade caveat currently and is going to be fixed in future.
Rest all the upgrade options through WebUI– TFTP, FTP, SCP and USB work fine and can be used to upgrade the code as a workaround. You can also upgrade the code on the controller through the Command Line Interface.