is possible unlock S6 sm-g920f andriod 5.1.1?
 

[Unlock phone started]

Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-G920F
Android Version: 5.1.1
Sales Code: TCL
PDA Version: G920FXXU2QOH8 [august 2015, rev8]
Phone Version: G920FXXU2COH2 [august 2015, rev2]
CSC Version: G920FVFG2COH4 [august 2015, rev4]
Product Code: SM-G920FZWATCL
HIDSw Version: G920FXXU2QOH8/G920FVFG2COH4/G920FXXU2COH2/G920FXXU2QOH8
Board Platform: EXYNOS5
Serial Number: RF8G4078BZK
Imei:
Unique Number: 03157DF3B5B4793C
Connections: AT,MTP
Battery Status: 4.34V (97%)
SIM Status: ABSENT
Knox Version: v30
Warranty Bit: 1

Unlocking...
Android version 5.1.1 detected. Using recovery based method.
Downloading custom recovery image. Be patient! Do NOT disconnect the phone!
Checking image.
Flashing custom recovery image.

Flashing firmware...
Switching to download mode.
Waiting for download mode.
Connecting.
Reading PIT.
Flashing recovery.img.
Flashing cache.img.
Restarting phone.
Recovery mode will start. You do not have to do anything. Be patient! Do NOT disconnect the phone!
Waiting for ADB connection. Be patient! Do NOT disconnect the phone!

Checking root state...
Rooted.
Reading and storing secure image. Be patient! Do NOT disconnect the phone!
Checking secure image.
Preparing.
Calculating. Be patient! Do NOT disconnect the phone!
Invalid keys.
Unable to unlock.
Finished at local time: [09.19.15 11:49:26]
WorkID: 7023662

It's an new security one. Impossible to do at the moment

Br;)