[TG] [TG11] Downgrading Axiom Lighthouse SW version

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I'm very new to forums so please excuse my questions, i hope someone can exist. I have a Grand Banks cruiser with a 9" and 12" Axiom screens, and old 400G autopilot and various old Ray marine instruments. I installed the system a few years ago when Axiom was released, along with 3 non Ray IP cameras. All worked very well until i upgraded to the newest 3.11.42, and the cameras went dead. I can log into the cameras via a PC sitting on the switch in the boat, so i know the cameras are OK. I have played with the camera settings but have come to the conclusion that I should try to go back to an earlier SW version (I don't really need the latest features, I prefer the cameras operating)
So here's the question, I have found on the Raymarine website a file entitled "raymarine_axiom_upgrade-3.8.105.img", am i able to load this file into my Axiom master and go back to this software version? Being an .img file i'm assuming it is a backup file (image)
If not, is this software available from Raymarine?

Bob