This is the latest firmware (T800XXU1ANF8) as of June 30, 2014 for the Galaxy Tab S 10.5 (Wifi) model (SM-T800).
"No-Wipe" means your app data and storage will all stay 100% in tact. Only system mods, custom kernels, and root will be removed as you are flashing stock firmware.
Please feel free to use as you see fit.
1. Download and extract.
2. In odin click on the AP button to load your extracted download.
3. Click on the check box next to the AP button.
4. Click start. Your tab will reboot when finished.
Would like someone else to confirm the above before people start following these instructions. Since they are here, they may be in trouble.
Sent from my rooted Galaxy S5.