i am pretty sure the next previous version is 1.0.3 and if you read on avids site if you down grade you will cause loss of amps since its a one time key you may not be able to upgrade back with out a new key. I could be wrong about it though.
I am pretty sure there have been no firmware updates since the expansion pack. I can't find any now or when I looked 2 years ago. mine had 2.x on it already but if you bought your expansion pack then there should be a down load link in your avid account were PT is' I can still download all my previous PT versions there if I wanted them. as well as all the versions of my plugins.
Eleven Rack Firmware Update Eleven Rack Firmware Version HistoryNote: The Eleven Rack Firmware Update Version 1.0.3 replaces the version 1.0.1 and 1.0.2 firmware updates, and includes all version 1.0.1 and 1.0.2 items. It is not necessary to run the previous firmware updates before updating to version 1.0.3.