SD card does not appear in boot manager menu

[KevinFFF]

Please share the result of the following command on your board.

$ cat /etc/nv_tegra_release
$ cat /etc/nv_boot_control.conf

@MattRoos

I’m not sure what that means. I used a mac to download and write the image to the SD card.

Since you are using the devkit, you could try using SDKM to flash the board with SD card connected.

@MattRoos

Can you share an instructional link? How can I access a log if I can’t boot the devkit?

Please refer to the following instruction to capture serial console log.
Jetson Nano & NX Style - Serial Debug Console - JetsonHacks