LG F800K FRP problem

Mode: Emergency
Model: F800K
Read info...
Laf Protocol: 01000009
Model name: LG-F800K
Software verion: F800K20f
Android verion: 8.0.0
Target operator: KT
Target country: KR
Chipset: msm8996
IMEI: 352159080865700
Elapsed: 14 secs. --> (v9.60)

Phone mode is DOWNLOAD
Start reset FRP...
Laf Protocol: 01000009
Model name: LG-F800K
Software verion: F800K20f
Android verion: 8.0.0
Target operator: KT
Target country: KR
Chipset: msm8996
IMEI: 352159080865700
Detecting write method...
Init write method... fail
Init misc method... fail
Init sign method...
Execute sign method...
Laf flash error: [sign64] could not find data 2 fail
Laf flash error: phone is not supported.
Error reset locks
Elapsed: 22 secs. --> (v9.60)