That article was very helpful, up until the point that I realized I have already done everything that is suggested. And the actual problem the user ran into was bad USB drivers. I have no problem connecting my device, and getting the .img to start pushing. It's after that when everything flies off the handle. let me post the FULL command prompt:
c:\android-sdk_r16-windows\SDK\platform-tools>fastboot flash recover amon-ra.img
sending 'recover' (7074 KB)...
OKAY [ 1.425s]
writing 'recover'...
(bootloader) signature checking...
FAILED (remote: signature verify fail)
finished. total time: 3.365s
That shows the path I'm running from, the command I'm initiating, and the name of the .img file I'm trying to push. It starts to send ("sending 'recover' (7074 KB)...") and says everything is ok. Then it starts "writing 'recover'...". Once it gets to the part of checking the bootloader signature it fails ("FAILED (remote: signature verify fail)"). That's the part that I don't understand, and am having a hard time with. I'm unlocked, everything has worked perfectly fine up until this point. Just at the "(bootloader) signature checking..." it runs into an issue.