Upgrade 32GB EMMC Module for KP3S Pro V2 and KLP1
MKS EMMC Adapter 1.0 for KINGROON KP3S Pro V2 and KLP1
To flash the EMMC Module, use high speed and high quality SD card adapter to mount it.
Check the below tutorial to get system image and know how to proceed:
How to Falsh the EMMC Chip on Kingroon KP3S Pro V2 and KLP1