@Enoblk
Unfortunately, Motorola can not count any better than they can write firmware these days. Despite the apparent information R02.30 is really a vintage 2014 release and should have been labeled R02.03. This release will require you to find "OLD" copies of CPS and the Firmware to jump through on your way to current support. I think it was R02.06 (2016) or maybe it R02.07 2017. That was the bridge.
I do not believe that any of this is on the old MOL or the new myView repositories, and while I have most of the CPS versions archived, I do not believe I have firmware for the 3500 series subscribers, so I can't help you.
As someone else indicated, after you jump forward, you then need to get to R02.10 add ESS/SUM and Then you can get "Current" all the way to M2022.01. But you don't have to be current with firmware to use the current RM / CPS packages as I program R02.09 and R02.10 as well as R1.12.17 subscribers everyday from the M2022.01 builds.
Good Luck --