Congrats, you will now need to get the mks emmc v2.0 adapter to flash the latest image…
Did it today three times 
You will get the image from the Sovol Documents Website.
And this is the direct link to the correct Download.
Ah, when you finished flashing.
Block these apt packages over ssh:
apt-mark hold linux-image-edge-rockchip64 linux-dtb-edge-rockchip64 linux-u-boot-mkspi-edge
Be patient with:
apt update && apt upgrade -y
It will upgrade 128 packages and took me 20 minutes to update.
Also remove the vnstat eth0 file:
sudo rm -rf /var/lib/vnstat/eth0
Greetings DrR00T90