BIGTREETECH Pi2 - Emmc-EN; Otg

BIGTREETECH Pi 2 User Manual
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3.6. eMMC-EN
Default position is OFF, which means the eMMC can be used normally. If you
do not wish to boot from eMMC, switch the EMMC-EN position to ON. This
will short the eMMC signal lines to GND and disable eMMC boot.
3.7. OTG
To enable OTG mode, switch the OTG KEY to the ON position. (Note: The
black USB 2.0 port will not function properly in this mode.)