Pinebook Pro won't post after hard reset

[i6Shot]

So you booted from SD card, copied SD to eMMC, like this, I assume: `dd if=/dev/mmcblk2 of=/dev/mmcblk0` Correct? And now booting to SD gives the same bad result as booting to eMMC did previously.  It sure sounds like you inadvertently copied the eMMC contents to the SD card.

If all this is correct, then re-flash the SD card with a bootable image, from another device.  Note that several bootable SD images won't work when written to the eMMC.  I'd copy a compressed image suitable for eMMC to the filesystem on the SD.  Boot from SD, and use `mount` to verify which device you've booted from.  Decompress and write your new eMMC image to the device you now think should be the eMMC.

I normally use NetBSD which doesn't use the mmcblk? nomenclature so I'm not positive what to recommend for which device is which.

Yep, you were correct, I pushed the eMMC to the SD card like a rookie. Went through and flashed my SD again, booted it, pushed it to the eMMC and tried to boot from the eMMC. Unfortunately, it wouldn't boot. Just ended up giving me a green light to indicate it was loading. I have tried booting with the eMMC Manjaro image and all I get is the Manjaro splash screen with the loading circle. Never actually boots or installs. I'm going to try a different image when it downloads and see how I get on.