Thanks for your question. Below are some links which you should find helpful. There is also a Manuals link on the left side of this page which has a lot of good information. SAGE Manuals
You can start here, but I think you already have access to the RTU Downloads area so below I have included links for the latest firmware for each RTU.
To download the latest firmware for your 2300's (C3413 CPU), this is the link.
To download the latest firmware for your 2400's (C3414 CPU), this is the latest version.
This guide will help you keep up to date as new updates come out.
I hope that helps and let us know if you have any more questions. Thanks.
Thank you for the information. I will read over and go from there.