UNLOCK INSTRUCTIONS:
Warning! Knox warranty must be active (0x00)!
1. Power on the phone.
2. Tap 7 times on 'Build number' in 'Settings'-'About phone' to enable 'Developer options',
go to 'Settings'-'Developer options' and enable 'USB debugging'.
3. Type *#0808# and select 'DM + MODEM + ADB' (or 'DM + ACM + ADB').
4. Connect the phone to PC with USB cable, install drivers if needed.
5. Select device in ADB settings.
6. Press 'Unlock TMB via Server' button for direct unlock, select 'Unlock TMB via Server', write your login and password in window if it will appear.
(Login and password will be saved as default after first input and can be changed in settings)

Unlocking using sever NEW:
Knox warranty does not matter.
1. Power on the phone.
2. Tap 7 times on 'Build number' in 'Settings'-'About phone'-'Software information'
to enable 'Developer options',
go to 'Settings'-'Developer options' and enable 'USB debugging'.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Select device in ADB settings.
5. Press 'Unlock TMB via Server' button for direct unlock, select 'Unlock TMB via Server New', write your login and password in window if it will appear.

Operation: Unlock
Selected model: SM-J727T
Software version: 36.8

Checking Login and Password... OK
Ballance: 22 crd.
You have 22 credit(s) left. This operation takes 5 credits.Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-J727T
Android version: 8.1.0
PDA version: J727TUVS5BSC2
CSC version: J727TTMB5BSC2
Phone version: J727TUVS5BSC2
Product code: SM2J727TZDATMB
CSC country code: USA
CSC sales code: TMB
Phone SN: R28K34R2D6Y
IMEI: 355619087082853
HW version: REV0.7
RF cal date: 20180401
Chip name: EXYNOS7870
Modem board: SHANNON315
Security patch: 2019-03-01
Boot Warranty bit: 0
SIM State: ABSENT
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching server... OK
Checking server answer... OK
Executing... OK
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... OK
Waiting ADB device... OK
Waiting for device to become ready... OK
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Rebooting phone... OK
Unlock done

Done with Samsung Tool PRO v.36.8