Ring Indoor Cam never recovers from initial Firmware Update

I recently bought 4 of the Ring Indoor Cameras for our home (we have an Elderly Mother-in-law to keep an eye on). 2 of them setup without issue, however 2 of them I was able to pair and go through initial setup (Connected them to wifi, my Eero saw them, all was good). They then went immediately to the initial software update, and never came back. Now, it seems like no matter what I do they're dead. No lights. Power cycles, different outlets, different cables, holding the button for 20s, 30s, a minute... Is there any way to recover these? Did I do something wrong in the setup?