lg h820 update to oreo but file writting not done

Welcome to Octoplus/Octopus Box LG Software version 2.9.1
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Checking data...OK
Platform: LG Qualcomm
Selected port: COM487
Selected model: H820
Reading info...
Mode: Normal
Firmware compiled date: Oct 28 2016
Firmware compiled time: 04:00:00
Firmware released date: Mar 3 2017
Firmware released time: 11:09:34
Opening "LGH820AT-00-V30a-ATT-US-AUG-10-2018-ARB01+0.tot"...OK
Firmware version: H82030a
Firmware model: LG-H820

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Prepairing firmware...OK
Selecting firmware partitions...OK
Selected default partitions!
Setting options...OK
Do you want to format User Data?
Reading partitions...OK
Formating USERDATA...OK
Formating ENCRYPT...OK
Writing 1/42 PrimaryGPT...Failed!
Performed by 2.9.1 Software version.