How to get a custom recovery to "stick" in Lollipop S5?

fuzzybabybunny

Moderator<br>Digital & Video Cameras
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Jan 2, 2006
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I just got the T-Mobile S5 with 5.1.1 and I want to:

1. Install TWRP.
2. Use TWRP to install the superuser zip file.

The bootloader is unlocked. I assume you need a custom recovery first before you can root the phone, right?

When I install TWRP with Odin it shows it was successful but booting into recovery shows just the stock recovery. There are tutorials that tell me how to deal with this issue but they all require the phone to already be rooted...

So... what do I do?