Orange light no boot blues :)

[feoh]

You'll have to disable the eMMC, power up, and at just the right time during booting, turn it back on.  There are instructions here on how to do it safely.  The thing is, the PBP is very, very fragile with the bottom taken off.  And, if you turn it upright with the bottom off, parts fall out.

Since you're getting a new eMMC and USB adapter, I wouldn't worry about it.  Putting the new eMMC in will solve your problem.  But you probably will want to "downgrade" the Uboot as suggested.

Thanks.

Totally replacing the emmc did indeed fix this. IMO it's awfully bad that Manjaro still references the emmc even when booting from SD, that really threw me for a loop.