Just for the record, the failed (out of the box) X2L that I have originally reported on here is the 8GB version without EMMC. I also tried multiple PD adapters (with 12V support, not all PD adapters support 12V output), to no avail.
I still have not sent mine in for replacement because the post to send it to China would cost roughly $40 which is about the same price as a brand new 2GB X2L. I am hoping someone discovers a solution to this problem that doesn’t involve physically returning it at my expense.