Problem while flashing built kernel


I have built the 3.18 kernel using the Legato-Dist-Source-mdm9x28-SWI9X07Y_02.11.00.00.tar.bz2 package.

I am trying to flash my MangoH board hosting a WP76xx using this; but I am getting the following error via the serial terminal:

B - 28295399 - Product type not supported 0x59393232
B - 28295765 - BOOT_HOLD=7,DOWNLOADER=boot,VERSION=SWI9X07Y_02.10.00.00 2018/02/21 11:51:28,TYPE=APPL,ERROR=Verification before download failed: Invalid product type (0X81),STATUS=FAIL

Can anyone help fix this ?