How do I unbrick my Galaxy Tab S 8.4 Wi-Fi?

[AC Question]

How do I unbrick my Galaxy Tab S 8.4 Wi-Fi

I have access to the Odin screen and the TWRP menu. I tried to flash an android 6.0 marshmallow ROM and it was loading for 45 minutes before I gave up. How can I get my tablet back to normal. Is it even possible!?

 

[Rukbat]

If you can get into TWRP and you made a system (or full) backup, restore the system. Otherwise, see if you can find a TWRP ROM backup for the device (look on XDA Forums) and restore the system. Worst case, flash the full stock ROM from SamMobile Firmwares.