If you are going to downgrade, please please PLEASE do not use Gateway to do it. You can use gateway for their flashcard (even though I feel they aren't worth it anymore) but their downgrade tools, and really their tools that modify NAND in general, are just terrible and brick-prone. Way too many cases of bricks caused by their tools. And the only reason to downgrade to 2.x is for OTP to install A9LH, which I highly recommend again using the free community-based tools instead of Gateway.
Once you do what you need to with community tools you can proceed to continue your use of Gateway.