[Galaxy Tab S Q&A, Help & Troubleshooting] chixvicious:
*Updated 3/2017 to include same for LL updated SM-T707A*

For anyone else who has the SM-T707A (tab s 8.4" AT&T LTE version) -

Issues with this tablet:

1. Upgrading to Lollipop - seems that without an actual AT&T sim card installed, you're not going to be able to upgrade from 4.4.2 (cannot download the OTA update, and I haven't been able to find a download of the firmware online ANYWHERE).

2. Locked Bootloader - possible to carrier unlock for any compatible GMS carrier (I'm using mine with a T-mobile sim card), but seems that there is no way to unlock the bootloader/install a custom recovery.

(**NOTE: DO NOT TRY AND INSTALL TWRP OR USE THE UNLOCK/RECOVERY UTILITIES FOR THE SM-T705 ... while it seems like they would effectively be the same devices, both have exynos cpu and identical specs...I have tested out the odin-flashable methods from the development section that are for the SM-T705, and THESE WILL SOFT BRICK YOUR DEVICE. A HUGE ISSUE, SINCE THE STOCK FIRMWARE IS REALLY REALLY REALLY DIFFICULT TO FIND..)

SILVER LININGS:

1. Even if you have to stay on 4.4.2, you should be able to root with Kingo Root.

2. If you are rooted with Kingo on 4.4.2, and want to switch to SuperSU app instead of the KingoRoot one, you can try this (worked for me):

**Update 3/2017 - this will also work on LL updated SM-T707A

1. Install SuperSU app through google play store (regular install...NOT an update via recovery). This means you will now have TWO Superuser apps installed on your phone. Only the Kingo Superuser will have the authority to grant SU permissions at this point. Now open SuperSU and make sure it is installed. It should ask you to update the SU binary (you won't be able to yet, but make sure you get the prompt).

2. Download a terminal emulator app, or enable usb debugging in dev options, connect phone to pc, and open an adb shell.

3. Follow the instructions for switching to SuperSU available on android forums (search for "bakageta" +" supersu to kingo" +"android forums" ).

4. Download [MENTION=2300913]bakageta[/MENTION]'s zip file and put on your sd card. Then open your terminal emulator or adb shell as root (type "su" + press enter) and run the first command: "# ./step0.sh" Remember to leave your terminal emulator open when you move on to the next step (same goes for your adb window).

5. Uninstall the Kingo Root apps (your tablet will then ~likely~ auto-reboot, closing the terminal emulator...DON'T PANIC, THIS IS OK.)

6. After your tablet boots back up, you should still have root**, but now your Superuser app will be SuperSU.

**UPDATE (3/2017, running the LL updated SM-T707A) If you are doing this on LL, you may need to also run the subsequent bakageta script, "# ./step1.sh" after the initial reboot to get SuperSU root access.

--> If anyone here knows how I can make a backup of the firmware I currently have installed (rooted stock 5.0.1) that can be used as a restore image via odin, please let me know! I'd gladly upload the file for anyone who is having trouble unbricking their devices, since the stock files are so insanely difficult to find for this particular variant of the tab s.

--Thanks to [MENTION=6674985]Kingxteam[/MENTION]

--Thanks to [MENTION=2300913]bakageta[/MENTION] for the alcatel scripts