This article applies to all Aruba controller platforms.
While uploading 3.3 code to a controller that is running 3.1 using tftp, you might encounter an error saying the transfer would not complete. This is because most TFTP servers/clients do not support file size more 32MB.
The workaround is to use ftp or webui to upload the code
However, upgrading from 3.2.x to 3.3.x works fine with TFTP.