J7 crown simple mobile S757tl is supported to unlock or no?

Hello, this model S757tl is not supported for unlock?, i try to unlock bin 1 and fail.

Start Exynos Unlock Phone Task on 12/6/2019 2:42:50 PM -05:00
Balance: 10 Credit(s)
ADBSN: 52007EE0EA864559
MODEL NAME: SM-S757BL
DID: 07B72E59CFD4
BOOTLOADER: S757BLUDU1ARF4
PDA VERSION: S757BLUDU1ARF4
MODEM VERSION: S757BLUDU1ARF4
CSC VERSION: S757BLUDU1ARF4
MODEM BOARD: SHANNON315
ANDROID VERSION: 8.0.0
CARRIER: TFO
SALE COUNTRY: USA
CPU: SAMSUNGEXYNOS7870
SIM STATE: ABSENT
SIM CONFIG: SS
USB CONFIG: MTP,ADB
Warranty Bit: 0
Connecting to COM133 ......OK
Reading Device Info......OK
MODEL NAME: SM-S757BL
IMEI: xxxxxxxxxxxxxxxxx
SN: xxxxxxxxxx
UID: CB007EE0EA8645
SWVER: S757BLUDU1ARF4/S757BLUDU1ARF4/S757BLUDU1ARF4/S757BLUDU1ARF4/S757BLTFN1ARF4
S757BLUDU1ARF4 is not support
PLEASE FLASH SUPPORTED ENG/COMBINATION MODEM!
Support File: https://samtool.org/dl/engmodem
Balance: 10 Credit(s)
Total time take: 00:00:03, finished on 12/6/2019 2:42:55 PM -05:00
 
Ok. Thank you. Other question. When the phone pass unlocked. I need to flash again the complete firmware or the engmoden stay and phone work fine
 
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