SD card booting woes

I’ve been unsuccessful in booting from an SD card. The L5 is a new one and I was able to flash it with the current non-encrypted image. u_boot_version is 2022.10-g9d134279b6.

I’ve tried 3 approaches:
A) Created /boot and /root partitions on the card, created file systems, used rsync to copy all the files. Edited /etc/fstab to have the correct UUID for the file systems.

B) Used dd command to copy the first part of eMMC to SD card, including partition table and the unallocated space. Created file systems, used rsync to copy all the files. Edited /etc/fstab to have the correct UUID for the file systems.

C) Flashed the same librem5r4.img used in eMMC to the SD card. Changed UUID of the 2 file systems and edited /etc/fstab to have the correct UUIDs.

I depress volume-down then the power button but it still always boots the eMMC system. What am I missing?

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