Reviving my Bricked Tablet via adb and Samsung's Download Mode Okay, here's the story:

I have a Samsung Galaxy Tab S 8.4". The OS doesn't matter, because it's gone. I had lollipop 5.0.2, decided to root it. OK, rooted it fine. Then decided to get CyanogenMod on it. Welp, when I was wiping it, I accidentally deleted the CM install zip with the rest. I was using TWRP to install the thing, but then I couldn't access it. So, I got Odin and tried to install that and the Clockwork mod. No help, and now Odin throws the "nand write start" error, which, from what I can tell from Google, mean my partitions are screwed up. (Edit: I re-flashed TWRP, and there was no error, but there is this error when getting ClockworkMod. Probably a messed up tar.)

Long story short, all I can do is use the Samsung Download mode, I have Odin, and I may have messed up my partitions.

I do have an adb backup, which means if I can get adb to recognize me device, I can roll it back.

adb seems like the best way to go, which is why I titled the post as it is.
Assuming you have the wifi-variant of the tablet.

Download the stock firmware from here. This file can be flashed via Odin when you're in Download-Mode. From there on you can restart your process of flashing TWRP and then the new ROM.