1. Activate ADB
2.connect phone to pc
3.open Z3X tool
4.select model (T307u)
5.go to unlock section
6.press unlock button
7.select (unlock via server DIAG Jan 2021)
8.wait for process
9.done
Note: process takes 5 credits from z3x tool
Checking Login and Password… OK
Balance: 13 CRD.
You have 13 credit(s) left. This operation takes 5 credits. Continue? Yes
Waiting ADB device… OK
Reading phone info…
Model: SM-T307U
Android version: 9
PDA version: T307UVLU3ATG7
CSC version: T307UOYV3ATG7
Phone version: T307UVLU3ATG7
Product code: SM2T307UZNABMC
CSC country code: Canada
CSC sales code: BMC
Carrier ID: ATT
Phone SN: R52N50N5JMA
IMEI: 352738111096995
HW version: T307U.03
RF cal date: 20200519
Chip name: EXYNOS7904
Modem board: SHANNON327
Security patch: 2020-07-01
Boot Warranty bit: 0
SIM State: NETWORK_LOCKED
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Waiting ADB device... OK
Searching Samsung diag port... detected COM44
Checking diag port... OK
Searching Samsung modem... detected COM43
Searching server... OK
Checking server answer... OK
Reading data from phone... OK
Backuping diag data... OK
Executing... OK
Restoring diag data... OK
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... OK
Unlocking... OK
Unlock done
Done with Samsung Tool PRO v.45.14 [SM-T307U,Unlock via Server DIAG Jan 2021]
2.connect phone to pc
3.open Z3X tool
4.select model (T307u)
5.go to unlock section
6.press unlock button
7.select (unlock via server DIAG Jan 2021)
8.wait for process
9.done
Note: process takes 5 credits from z3x tool
Checking Login and Password… OK
Balance: 13 CRD.
You have 13 credit(s) left. This operation takes 5 credits. Continue? Yes
Waiting ADB device… OK
Reading phone info…
Model: SM-T307U
Android version: 9
PDA version: T307UVLU3ATG7
CSC version: T307UOYV3ATG7
Phone version: T307UVLU3ATG7
Product code: SM2T307UZNABMC
CSC country code: Canada
CSC sales code: BMC
Carrier ID: ATT
Phone SN: R52N50N5JMA
IMEI: 352738111096995
HW version: T307U.03
RF cal date: 20200519
Chip name: EXYNOS7904
Modem board: SHANNON327
Security patch: 2020-07-01
Boot Warranty bit: 0
SIM State: NETWORK_LOCKED
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Waiting ADB device... OK
Searching Samsung diag port... detected COM44
Checking diag port... OK
Searching Samsung modem... detected COM43
Searching server... OK
Checking server answer... OK
Reading data from phone... OK
Backuping diag data... OK
Executing... OK
Restoring diag data... OK
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... OK
Unlocking... OK
Unlock done
Done with Samsung Tool PRO v.45.14 [SM-T307U,Unlock via Server DIAG Jan 2021]