LG K520DY flash error

so i tried to reset the screen lock of my LG K520DY and got an error message with the device rebooting to download mode. couldn't get it to load normally so decided to flash it.

Downloaded K520DY10b_00_0517.kdz from server and proceeded to flash but got this error message:

LG 2-3G Tool v9.61
supported models: 1571

Mode: Emergency
Model: K520DY
Read info...
Laf Protocol: 01000004
Model name: LG-K520DY
Software verion: K52010a
Android verion: 6.0.1
Target operator: GLOBAL
Target country: COM
Chipset: msm8916
IMEI: 357587080483352
Elapsed: 5 secs. --> (v9.61)

Phone mode is DOWNLOAD
Start flashing.
Laf Protocol: 01000004
Open KDZ File : K:\LG\K520DY\K520DY10b_00_0517.kdz
Checking file hash...
Model : LG-K520
SwVersion : K52010s
BuildTime : 0000-00-00 00:00:00
Total Files : 56
Model name: LG-K520DY
Software verion: K52010a
Android verion: 6.0.1
Target operator: GLOBAL
Target country: COM
Chipset: msm8916
IMEI: 357587080483352
Laf flash error: incompatible partition table [start] 01D1C800:01D59FDD, grow
Laf cmd error: LAF_CMD_UNLINK fail[LAF_ERROR_FAILED].
Start indirect download mode.
Sending image...
Laf Protocol: 01000004
Checking file hash...
Laf cmd error: LAF_CMD_OPEN fail[LAF_ERROR_FAILED].
Retry Download 1 time(s)
Laf Protocol: 01000004
Checking file hash...
Laf cmd error: LAF_CMD_OPEN fail[LAF_ERROR_FAILED].
Retry Download 2 time(s)
Laf Protocol: 01000004
Checking file hash...
Laf cmd error: LAF_CMD_OPEN fail[LAF_ERROR_FAILED].
Retry Download 3 time(s)
Laf Protocol: 01000004
Checking file hash...
Laf cmd error: LAF_CMD_OPEN fail[LAF_ERROR_FAILED].
Retry Download 4 time(s)
Laf Protocol: 01000004
Checking file hash...
Laf cmd error: LAF_CMD_OPEN fail[LAF_ERROR_FAILED].
Indirect download error.
Flashing error.
Elapsed: 196 secs. --> (v9.61)

how do i fix this issue please?

awaiting your kindest assistance.