Why isn't my BBB booting from microSD card?

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1

I have written a new Debian 9.3 image to a microSD card and have
plugged it into my BBB. However the BBB is still booting from the
EMMC. How do I make it boot from the microSD card?

Is there maybe something wrong with the microSD card image? It
automounts on the BBB OK and appears at /media/rootfs with what look
like the right sort of contents.

2

No there's something wrong with the version installed to the eMMC,
it's called being "ancient"..

Either hold down the "boot" button every time, nuke the eMMC, or
re-flash the eMMC..

Regards,