There's no reason to try and salvage a ring camera. Their business model is subscriptions and data collection; I'm not aware of any projects to flash them with custom firmware, and my guess is they're locked down hard to prevent it because that's their entire revenue model, you're free to keep looking but I'd bet it's a dead end or at the very least much more than an afternoon project.

Get a Wi-Fi reolink and connect it to an ONVIF capable NVR. You can use a paid solution like blue iris on a Windows machine or there's plenty of free options for any OS of your choice. You can probably directly access the feed by navigating to the camera IP but I'm not sure, I don't use mine that way. Without some kind of NVR software you won't get a lot of the features people like such as notifications and two way talk, object/person recognition, etc.