Thanks again for you reply.
1: Yes, that’s the doc I referred to. It mentions Multiboot mode, U-boot mode, Serial Mode, Upgrade mode, Maskrom mode, TST mode, and Upgroup mode. But, in most cases, it only explains how to initialize those modes without explaining what to do once in those modes or what kind of visual feedback the user should see to confirm progress.
2: I was trying to microSD boot into Edge_Ubuntu-lxde-bionic_Linux-4.4_arm64_SD-USB_V20190830.img, which was burned onto the microSD with Balena Etcher. It contains a /dtb folder with the Khadas dtb files. I assume that it is not necessary to rename Khadas dtb. (didn’t see any instructions about renaming dtb images)
3: Yes, Android was pre-installed on the eMMC. But, quit working after my failed attempt to boot from the SD card. Would be nice to understand what caused it, so I don’t do that again. But, now that I’m here, how do I get out of this mess?
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