Yes, the switch is mislabeled, think short (clock) disabled, so there is a emmc clock working since not shorted
you have a uboot prompt, type help
also.... mmc help
that version of uboot is either not scanning mmc or card is not setup right
(or not a good card)
try writing the image to a usb stick, try BOTH usb sockets
is it a 1 or 2 partition image?
uboot will be looking for either boot,scr or extlinux.conf or aarch64.efi (only 1)
any of these must be in correct location
-----
as well, sometimes the paths in extlinux.conf can be wrong, paths are in relation to itself,
I had that happen only last week from my inherited son's pbp
you have a uboot prompt, type help
also.... mmc help
that version of uboot is either not scanning mmc or card is not setup right
(or not a good card)
try writing the image to a usb stick, try BOTH usb sockets
is it a 1 or 2 partition image?
uboot will be looking for either boot,scr or extlinux.conf or aarch64.efi (only 1)
any of these must be in correct location
-----
as well, sometimes the paths in extlinux.conf can be wrong, paths are in relation to itself,
I had that happen only last week from my inherited son's pbp