Version 31.7.3 adds a new modular software package (XMOD) to help upgrade a stack from from ExtremeXOS 30.1 or 22.x or older to 30.3 or later. The XMODs are onie-tftp-1.1.xmod, summitX-tftp-1.1.xmod, and summit_arm-tftp-1.1.xmod. For more information, see Knowledge Base article 000058389.
If you choose to forego this XMOD, then you cannot automatically update a switch running ExtremeXOS 30.1 or earlier to ExtremeXOS 30.3 or later due to a file system compatibility issue. If a switch has ExtremeXOS 30.1 or earlier, prior to inserting the switch into the stack topology, you need to upgrade the switch manually: