Re-flash eMMC of J1020

I have a J1020. And looking to re-flash the mmc as it doesn’t boot up to desktop.

I see instructions here to re-flash the mmc here for J1010 J1010 Carrier Board - Seeed Wiki

This refers to Type-C which is not there on the J1020
Step 3. Then use two different Type-C cables to connect the carrier board separately. One to the 5V/3A DC power supply and one to the Ubuntu host.

What would be the equivalent steps for J1020?