sm-t357T Unlock Fail

i am trying to unlock the phone
But Failure 🙁

please chq the log ….

Code:

Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-T357T
Sales Code: TMB
Country Code: USA
Android Version: 5.0.2 [LRX22G]
Build Date: Mon Jul 13 18:44:04 KST 2015
PDA Version: T357TUVU1AOG6 [july 2015, rev6]
Phone Version: T357TUVU1AOG6 [july 2015, rev6]
CSC Version: T357TTMB1AOG6 [july 2015, rev6]
Product Code: XXXXXXXXXXXTMB
HIDSw Version: T357TUVU1AOG6/T357TTMB1AOG6/T357TUVU1AOG6/T357TUVU1AOG6
Board Platform: MSM8916
Modem Platform: MSM8916
Serial Number: R52GA0HY77K
Imei: 351969071512181
Unique Number: C00001CB841E672
Connections: AT,MTP
Battery Status: 4.23V (90%)
SIM Status: NETWORK_LOCKED
Knox Version: v30
Warranty Bit: 0

Checking root state...
Not rooted.
There is no backup, because there is no root access.

Unlocking...
Appropriate serial port is not available.
1. On dial window enter *#0808# or *#9090# or *#7284#
2. Select DM+MODEM+ADB
3. Tap OK on phone display
4. Click OK button
Appropriate serial port is not available.
1. On dial window enter *#0808# or *#9090# or *#7284#
2. Select DM+MODEM+ADB
3. Tap OK on phone display
4. Click OK button
Appropriate serial port is not available.
1. On dial window enter *#0808# or *#9090# or *#7284#
2. Select DM+MODEM+ADB
3. Tap OK on phone display
4. Click OK button

On the port section of the device manager window check for the presence of the samsung serial port!
Canceled
Finished at local time: [01.03.16 17:57:05]
WorkID: 8601297