lg g4 ls991 flashing eror and phone dead

Welcome to Octoplus/Octopus Box LG Software version 2.8.3
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Checking data...OK
Platform: LG Qualcomm
Selected port: COM91
Selected model: LS991
Reading info...
IMEI: 357355-06-228588-4
Android version: 6.0
Battery level: 0%
SW Version: H81520O
Mode: Emergency
Initializing flash...OK
SW version: H81520O_02
Android version: 6.0
LAF Version: 1.1
Product ID: PT01S150518001176
IMEI: 352513-07-134940-7
Target operator: SPR
Hardware: rev_10
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Writing phone firmware without real necessity is at your own risk.

Downgrade may lead to phone damage!

Please, make sure the phone's battery is fully charged.
Disconnect all other devices from the computer (including phones,
modems, etc.) and close all other running programs.
To avoid errors in the flashing process, use a clean PC (without any
installed drivers for other Qualcomm-based devices).
You should not run any other programs or attach new devices to your
computer during the flashing!
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Opening "ls991zv9_12_arb02_4.oct"...OK
Setting options...OK
Reading partitions...OK
Formating USERDATA...OK
Formating ENCRYPT...OK
Writing PrimaryGPT...OK
Writing modem...OK
Writing pmic...OK
Writing sbl1...OK
Writing tz...OK
Writing sdi...OK
Writing hyp...OK
Writing rpm...OK
Writing aboot...OK
Writing sbl1bak...OK
Writing pmicbak...OK
Writing tzbak...OK
Writing hypbak...OK
Writing rpmbak...OK
Writing abootbak...OK
Writing sdibak...OK
Writing persist...OK
Writing sec...OK
Writing laf...OK
Writing boot...OK
Writing recovery...OK
Writing raw_resources...OK
Writing raw_resourcesbak...OK
Writing factory...OK
Writing system...Failed!
LAF Error: 00000000.
Write Firmware operation is currently not supported for your phone's
firmware.
Error code: ZXLCALSZXC
Performed by 2.8.3 Software version.