BIGTREETECH Pi2 - Erasing Emmc after Booting from Microsd Card

BIGTREETECH Pi 2 User Manual
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4.4.2. Erasing eMMC After Booting from MicroSD Card
1. Refer to the steps in "4.3.2 Writing System onto eMMC Using a
MicroSD Card" and log into the system terminal.
2. Run the command sudo mkfs /dev/mmcblk1 and then enter "y" to
confirm.