ReadyNAS Management Service is Offline

Hi everyone, first post here. I've bought a ReadyNAS 312 off a friend and tried to factory default it for my own use but am having troubles with it ever since.

When I first got the device, I could see it in RAIDar with both disks in good condition, links to the admin pages etc were all there and I could load the admin page (though I didn't have the admin password). https://readycloud.netgear.com/ could discover the device as well.

Since trying the Factory default though (done via the boot menu as described here), I've only been seeing that the "Management Service is offline" in RAIDar and I can no longer access the admin page. The only button available in RAIDar is "Offline Setup (LAN)" but clicking that just attempts to load the admin page and fails. Looks like I have no ability to collect logs via RAIDar..

I've since also tried the OS Re-Install option from the boot menu but this just seems to result in the power button light blinking infinitely.

All I can think to try next is USB Recovery of the device but at this point I'm worried about just digging my hole deeper.. Is this a sound decision or is there something else I should try?