I cannot root my S5... need help

[AC Question]

Every root method I use (KingoRoot, Odin/CF Auto-root) blacks my screen out and indefinitely displays this error message:
RECOVERY BOOTING.....
RECOVERY IS NOT SEANDROID ENFORCING
Set Warranty Bit : recovery

I then have to use Odin to get my phone back to normal.
I've tried to enable OEM Unlock on my phone but I don't have the option.
Is there anything I can do?
Model number: SM-G900F
Android version 5.0
Carrier: DTAC (Thailand)

 

[VW Maverick]

Welcome.
Samsung has locked their bootloaders which makes it very, very difficult, if not impossible, to root their devices.

Mav.

 

[anon(632115)]

The reactivation lock can be switched off using your Samsung account. You will need to do that before "playing". Have you seen this? Root Samsung Galaxy S5 SM-G900F on Android 5.0 Lollipop using CF-Auto-Root - How To