for those who like to tamper: there's a recovery firmware intended for the gtpab 8.4 for Ukraine available for download. Don't know if Kies works on this device yet.
But if you blow your device off the rails, this will get it booting again:
Oh, my, this is better than I expected - it recovered /system but didn't blow out my personalization. Freaking wonderful!
If your device "recovery bootloops," by which I mean:
you try a Chainfire root from the snapdragon note 8 on the tab pro 8.4
your device boots and tells you that you're bad, that Samsung knows your bad, and then displays something like
"RECOVERY IS NOT SEANDROID ENFORCING...
Set Warranty bit : recovery"
and reboots you, here's the fix:
take your a slim object and starting at the USB port, pry the backing loose one snap at a time, working left to right along the bottom and around the lower corners on each side.
Now, gently, start to pry down each side.
You'll feel central resistance. That's because there's adhesive holding the backplate to an internal frame that laps over the USB connector. Gently pry that up.
Once you're about halfway down each side, you can see the battery connector - six wires, two each black, blue, red. Keep going; there is another point of resistance at the camera housing. Gently finesse that last after you have all the other snaps off.
Free the battery from the mainboard by prying up the connector, or unscrew the 4 screws holding it in place and use the battery's weight to free it from the mainboard.
Let the device sit about 30 seconds.
Reconnect the battery.
Hold the home, volume down and power buttons simultaneously to bring the device into download mode and recover using Odin or your tool of choice.
Once you've recovered, button it back up.