Gw300fd unlock problem.

Welcome to Octoplus/Octopus Box LG Software version 2.1.8
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Platform: LG Qualcomm
Selected port: COM1
Selected model: GW300FD
Checking data…OK
Disconnect battery and connect USB cable to phone…OK
Sending preloader…OK
Reconnecting phone…Failed!
Ping failed.

Try 2 pc but same error need help for unlock. All install ok.