[T-Mobile Samsung Galaxy S6] lionking2k:
Here are the steps I do in order to make it work for my phone:

Phone model: SM-G920T

Android version: 5.1.1

Baseband version: G920TUVU2COF8

(Most of the steps are from the author in page 1, but I've added some more details especially for the TWRP ap.)

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Steps to load "Bootloader and Baseband" into your phone.

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01- Download all the related files for your phone model from this topic (1st page).

02- Reboot your phone in "Download" mode by pressing "Volume Down"+"Home"+"Power" at the same time. When you see the greenish screen appears telling you that "if you want to go to downloading mode press Volume Up" then do so.

04- Now connect your phone to your PC/Laptop.

05- Open Odin 3.10.6 (Must be the correct version, other versions don't work properly!)

06- You must see that Odin recognizes your phone by showing the COM port number. If you don's see it then you cannot doing anything with Odin period! Usually if you don't see the COM port showing up then you need to re-install/update your drivers to make sure there's a proper connection bettween your phone with your PC/Laptop.

07- Now from Odin click "BL" button and browse to find your "bootloader.tar.md5" file.

08- Now from Odin click "CP" button and browse to find your "baseband.tar.md5" file.

09- Then don't click anything else except the "Start" button to begin the update process.

10- Wait until it finishes flashing, then your computer will re-start automatically.

11- While it re-start you could close Odin and unplug the cord with your cell phone.

12- Wait till the re-start complete

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Steps to load "TWRP" into your phone.

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01- Reboot your phone in "Download" mode by pressing "Volume Down"+"Home"+"Power" at the same time. When you see the greenish screen appears telling you that "if you want to go to downloading mode press Volume Up" then do so.

02- Now connect your phone to your PC/Laptop.

03- Open Odin 3.10.6

04- You must see that Odin recognizes your phone by showing the COM port number. If you don's see it then you cannot doing anything with Odin period! Usually if you don't see the COM port showing up then you need to re-install/update your drivers to make sure there's a proper connection bettween your phone with your PC/Laptop.

05- From Odin click the "AP" button and browse to find your "twrp-2.8.7.1-zeroflte.img.tar" file.

06- Then don't click anything else except the "Start" button to begin the update process.

07- Wait until it finishes flashing, then your computer will re-start automatically.

08- While it re-start you could close Odin and unplug the cord with your cell phone.

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Steps to load "Rapture" ROM into your phone.

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01. Make sure "OEM Unlocking" is enabled in Developer options!

02. Place "Rapture" ROM on your internal storage! (this means transfer the file into your SamSung phone under the "Phone" directory.)

03. Reboot your phone into "Recovery" mode by:

- Turn off your phone.

- Pressing "Volume Up"+"Home"+"Power" at the same time. When you see the "SamSung" logo then release your fingers, no need to hold them anymore. Wait for blue screen of TWRP app appears.

04. Tap wipe

05. Tap advanced wipe

06. Place a check next to .. dalvik cache, system, data and cache

07. Swipe to wipe

08. Tap the home button bottom left button!

09. Tap wipe

10. Now swipe to factory reset!

11. Tap "install" and browser and find the ROM file in your phone folder!

12. Swipe to install ROM

13. Now reboot!

14. You're done!!!

15. First boot can take a bit be patient (in my case it will take from 3-5 minutes, during that time you only see the SamSung logo. That's normal and be patient!)