Nevermind…don’t want to delete my above post in case some else searches for similar.
What I did to solve was this:
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Boot with SD card inserted
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Press space to break uboot
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Eject SD Card
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Type
boot
cmd -
Boot into Linux via eMMC, login then run
sudo /opt/u-boot/bb-u-boot-beagleboneai64/install-emmc.sh
sudo /opt/u-boot/bb-u-boot-beagleboneai64/install-microsd.sh
sudo reboot