t399 not unlocked how to BST?

Scanning devices … 1 found
dev[1]
Manufactory: SAMSUNG
Model: SGH-T399
Hardware: UNIVERSAL_GARDA
Mode: normal
Checking environment …
System Info
Display ID: JDQ39
System Ver: 4.2.2 REL
API Level: 17
Incremental: T399UVUAMJ4
Model: SGH-T399
Brand: samsung
Device: gardaltetmo
Platform: exynos3
Language: en
Rigion: US

Device Info
SerialNumber: 479008cd11b19071
Hardware: universal_garda
Model: gardaltetmo
PDA Version: T399UVUAMJ4
Phone Version: T399UVUAMJ4
Bootloader ver: T399UVUAMJ4
Ril HW ID:REV1.0
Sales Code: TMB
Model ID: UNKNOWN
Get Bluetooth info failed
Get WI-FI info failed
Network [1]: GSM IMEI: 358921xxxxxxxxx
Root Access: ROOTED

Time used : 2.6 s

Device Authentication … 1 failed with MSL
Prepare environment … Device do not have ADB interface, turn on device USB DEBUG and connect with usb cable,then re-scan device
This operation need boot to normal mode
Reboot device to NORMAL mode …
Wait device ready … can’t wait a UART connected device boot ready.
Time used : 1 min 16 s

Prepare environment …
Bypass MSL … Not supported NV data
Time used : 7.0 s

Device Authentication … 1 failed with MSL
Prepare environment …
Bypass MSL … Not supported NV data
If not support read codes, use Unlock instead
Time used : 32.6 s

Device Authentication … 1 failed with MSL
Prepare environment …
Bypass MSL … Not supported NV data
Time used : 15.6 s

Prepare environment …
Bypass MSL … Not supported NV data
Time used : 7.1 s