lg D821 FLASHING ERROR


Welcome to Octoplus/Octopus Box LG Software version 2.1.7
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM4
Selected model: D821
Reading info…Failed!
Port busyFailed!
Could not detect mode!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM49
Selected model: D821
Reading info…Failed!
Could not detect mode!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM49
Selected model: D821
Reading info…Failed!
Could not detect mode!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM49
Selected model: D821
Reading info…Failed!
Could not detect mode!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM34
Selected model: D821
Reading info…Failed!
Could not detect mode!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM34
Selected model: D821
Reading info…Failed!
Could not detect mode!
——————————————————————————–
Platform: LG Qualcomm
Selected port: COM34
Selected model: D821
Reading info…Failed!
Could not detect mode!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM4
Selected model: D821
Reading info…Failed!
Port busyFailed!
Could not detect mode!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM4
Selected model: D821
Reading info…Failed!
Port busyFailed!
Could not detect mode!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM49
Selected model: D821
Reading info…OK
Mode: Fastboot
Model ID: hammerhead D821(E) 16GB
Device serial number: 08158d31021f938c
Hardware: rev_11
Bootloader lock state: locked
Opening "LGD821AT-00-V10b-NXS-OCT-31-2013-KRT16M-USER-16G+
0.oct"…OK
Initializing flash…Failed!
——————————————————————————–
Checking data…OK
Platform: LG Qualcomm
Selected port: COM49
Selected model: D821
Reading info…OK
Mode: Fastboot
Model ID: hammerhead D821(E) 16GB
Device serial number: 08158d31021f938c
Hardware: rev_11
Bootloader lock state: locked
Opening "LGD821AT-00-V10b-NXS-OCT-31-2013-KRT16M-USER-16G+
0.oct"…OK
Initializing flash…Failed!

HOW TO SOLVE ?