bricked it?

[bcnaz]

none of the threads i've found so far have helped, as similar or different as they looked. the gist seems to be "boot from sd and reflash emmc", but the thing just won't boot from anything at this point.

  Have you tried turning off your eMMC  ?
    if the boot on it is messed up, it will not allow the sd card to boot.
    The boot procedure to start from sd first is on the eMMC,  so if that is corrupt you will not boot from the sd card.

     I see where another forum member was able to boot from sd after turning off the eMMC  
                     ( See wiki for the switch location in the board  )

     IF  you succeed,  with being able to boot in this fashion...   (after this,  proceed to next step)

      Next  you need to turn the eMMC switch back on at the correct time during the boot sequence.   

      This person did state he had to try several times before he got the switch turned on at the correct time.

      When you are able to get booted and have the eMMC turned back on,   you should be able to re-install your OS.

       I am looking into being able to use a usb to eMMC adapter to load the OS onto the eMMC.
          (using another computer to download and install to the eMMC via the usb adapter)

      I have a 128gb eMMC I would like to swap out with my original 64gb drive.

     I hope this is helpful

        BC

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Have you looked at the thread ' Restore default Debian system ' ?

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The usb to eMMC adapter is available from the Pine store, but that can take 3-4 weeks for delivery.