Download official TWRP custom recovery flash file for Samsung Galaxy Tab S 8.4 WiFi from the link here and learn how to install/flash via Odin, Samsung official flash tool.
If you notice that any of the links provided below is broken or doesn’t work, please post in comments section so we fix and update it ASAP.
File Name: twrp-3.1.1-0-klimtltewifi.img.tar
Size: 6.5 MB
Recovery – Download
Instructions to flash custom recovery on Samsung Galaxy Tab S 8.4 WiFi
Once you have downloaded the custom recovery from above link, click here to learn how to flash.