Hard reset+Frp 
With UnlockTool
Lenovo Legion [EDL] FACTORY RESET Waiting for HS-USB QDLoader 9008... COM36
Selected Model : Lenovo Legion Phone Duel
Code Name : L79031
Operation : Factory Reset [1]
Authenticating... OK
Retrieving server data... OK [350.29 KiB]
Initializing data... OK
Waiting for HS-USB QDLoader 9008... COM36
Connecting to device... OK
Handshaking... OK
Reading bootloader info... OK
Serial : 4015316498 SoC : [Snapdragon 870] [SM8250-AC] [0x000C30E1]
OEM : Qualcomm [0x0000] Model : Unknown [0x0000]
PK_HASH[0] : E69E6369BDA2D2990E75A87BB9F7A21C
PK_HASH[1] : A84FBF04E7857B19B8B07B0E54621075
Writing flash programmer... OK
Connecting to flash programmer... OK
Configuring device... OK
Firehose config : UFS [Sector:4096] [Target:0] [Host:1048576]
Reading partition map... OK - LU Count : 6
Reading software info... OK [super]
Model Name : Lenovo L79031
Product Name : moba_row_sa
Manufacturer : Lenovo
Platform : kona
Android Version : 10
Security Patch : 2020-08-01
Build : 12.0.017_201004
Build Date : Sun Oct 4 11:19:10 CST 2020
Erasing FRP... OK
Erasing USERDATA... OK
Rebooting... OK
UnlockTool

With UnlockTool
Lenovo Legion [EDL] FACTORY RESET Waiting for HS-USB QDLoader 9008... COM36
Selected Model : Lenovo Legion Phone Duel
Code Name : L79031
Operation : Factory Reset [1]
Authenticating... OK
Retrieving server data... OK [350.29 KiB]
Initializing data... OK
Waiting for HS-USB QDLoader 9008... COM36
Connecting to device... OK
Handshaking... OK
Reading bootloader info... OK
Serial : 4015316498 SoC : [Snapdragon 870] [SM8250-AC] [0x000C30E1]
OEM : Qualcomm [0x0000] Model : Unknown [0x0000]
PK_HASH[0] : E69E6369BDA2D2990E75A87BB9F7A21C
PK_HASH[1] : A84FBF04E7857B19B8B07B0E54621075
Writing flash programmer... OK
Connecting to flash programmer... OK
Configuring device... OK
Firehose config : UFS [Sector:4096] [Target:0] [Host:1048576]
Reading partition map... OK - LU Count : 6
Reading software info... OK [super]
Model Name : Lenovo L79031
Product Name : moba_row_sa
Manufacturer : Lenovo
Platform : kona
Android Version : 10
Security Patch : 2020-08-01
Build : 12.0.017_201004
Build Date : Sun Oct 4 11:19:10 CST 2020
Erasing FRP... OK
Erasing USERDATA... OK
Rebooting... OK
UnlockTool
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