problem unlock LG K373

hello plz help me
for unlock this phone :


LG 2-3G Tool v9.48
supported models: 1555

Not detect phone! Please manual select port or reboot PC!
Not detect phone! Please manual select port or reboot PC!
Check adb server status... OK
Device name: LG-K373
Firmware version:
Android release: 6.0
Platform: msm8909
Root status: Phone not rooted! Root phone manual!
Elapsed: 4 secs. --> (v9.48)

Reading timeout, check cable
Error Code: ReadInfo,1,1
Elapsed: 2 secs. --> (v9.48)

Check adb server status... OK
Found 1 device(s)
Device name: LG-K373
Firmware version:
Android release: 6.0
Platform: msm8909
Start root...
Send exploit: OK!
Install exploit: OK!
Root status: ERROR!su

/system/bin/sh: su: not found
127|shell@m1v:/ $
Elapsed: 23 secs. --> (v9.48)

Reading timeout, check cable
Error Code: ReadInfo,1,1
Elapsed: 2 secs. --> (v9.48)

Not detect phone! Please manual select port or reboot PC!
Check adb server status... OK
Device not found!
Elapsed: 0 secs. --> (v9.48)

Check adb server status... OK
Device not found!
Enable USB DEBUG (Setting -> Develop -> Usb Debug)!
Elapsed: 0 secs. --> (v9.48)

Check adb server status... OK
Device name: LG-K373
Firmware version:
Android release: 6.0
Platform: msm8909
Root status: Phone not rooted! Root phone manual!
Elapsed: 1 secs. --> (v9.48)

Check adb server status... OK
Device name: LG-K373
Firmware version:
Android release: 6.0
Platform: msm8909
Root status: Phone not rooted! Root phone manual!
Elapsed: 1 secs. --> (v9.48)