ya esa operación se le realizó de instalar el teléfono
aca le dejo los log de las acciones de desbloque y la de reinstalación del celular
Operation: Unlock TMB via Server Upload Nov 2020
Selected model: SM-J337T
Software version: 43.18
Checking Login and Password... OK
Balance: 20 crd.
You have 20 credit(s) left. This operation takes 5 credits. Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-J337T
Android version: 8.0.0
PDA version: J337TUVS9ATH1
CSC version: J337TTMB9ATH1
Phone version: J337TUVS9ATH1
Product code: SM-J337TZDATMB
CSC country code: USA
CSC sales code: TMB
Carrier ID: TMB
Phone SN: RF8M43K4AHV
IMEI: 352149102249009
HW version: REV0.7
RF cal date: 20190426
Chip name: EXYNOS7570
Modem board: SHANNON305
Security patch: 2020-08-01
Boot Warranty bit: 0
SIM State: NETWORK_LOCKED
Waiting for device to become ready... OK
Reading IMEI... OK
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching Ramdump interface... COM46 detected
Rebooting phone... OK
Waiting ADB device... OK
Waiting for device to become ready... OK
Reading ramdump data from phone... 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... error (4.12.0)
Retry 1...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 2...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 3...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 4...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 5...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 6...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 7...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 8...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 9...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Retry 10...
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (4.12.0)
Operation: Unlock TMB via Server Upload Nov 2020
Selected model: SM-J337T
Software version: 43.18
Checking Login and Password... OK
Balance: 15 crd.
You have 15 credit(s) left. This operation takes 5 credits. Continue? Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-J337T
Android version: 8.0.0
PDA version: J337TUVS9ATH1
CSC version: J337TTMB9ATH1
Phone version: J337TUVS9ATH1
Product code: SM-J337TZDATMB
CSC country code: USA
CSC sales code: TMB
Carrier ID: TMB
Phone SN: RF8M43K4AHV
IMEI: 352149102249009
HW version: REV0.7
RF cal date: 20190426
Chip name: EXYNOS7570
Modem board: SHANNON305
Security patch: 2020-08-01
Boot Warranty bit: 0
SIM State: NETWORK_LOCKED
Rebooting phone... OK
Waiting ADB device... OK
Waiting for device to become ready... OK
Reading IMEI... OK
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... OK
Searching Ramdump interface... COM46 detected
Rebooting phone... OK
Waiting ADB device... OK
Waiting for device to become ready... OK
Reading ramdump data from phone... 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... error (4.12.0)
Retry 1...
Initialization zTool... error (0.20)
Operation aborted
Operation: Flash
Selected model: SM-J337T
Software version: 43.18
File analysis... OK
Total file size: 0xE48058AE (3656 Mb)
Searching USB Flash interface... COM46 detected
Setup connection... OK
Set PIT file... OK
Reading PIT from phone... OK
Sending sboot.bin.lz4... OK
Sending param.bin.lz4... OK
Sending cm.bin.lz4... OK
Sending boot.img.lz4... OK
Sending recovery.img.lz4... OK
Sending system.img.lz4... OK
Sending vendor.img.lz4... OK
Sending userdata.img.lz4... OK
Sending modem.bin.lz4... OK
Sending cache.img.lz4... OK
Sending odm.img.lz4... OK
Sending omr.img.lz4... OK
Flashing done (time - 00:02:29)
la segunda vez que se pidió desbloquear, fue después de haberlo reinstalado según decia la Z3x