root your phone

Waiting ADB device... OK
Reading phone info...
Model: SM-S550TL
Android version: 6.0.1
PDA version: S550TLUDU1APG1
CSC version: S550TLTFN1APG1
Phone version: S550TLUDU1APG1
Product code: SM-S550TZKATFN
CSC country code: USA
CSC sales code: TFN
Phone SN: RV8J405H38N
IMEI: 359578072820998
HW version: REV0.4
RF cal date: 20170406
Chip name: EXYNOS3475
Modem board: SHANNON308
Security patch: 2016-07-01
Boot Warranty bit: 0
Incorrect model selected. This may damage your phone. Continue? Yes
Checking Super user right... false
Root your phone manually and then repeat

Done with Samsung Tool PRO v.33.8