Pinebook Pro not booting

[waweic]

Yes, I have read the same thing in the Wiki. I have also talked to people on the IRC. I am now as far as yesterday. Android boots, I have tried any image on the Wiki, have tried to boot them with eMMC enabled an disabled but none of them is starting. I am pretty desperate right now because this machine isn't of much use to me without linux and I do not have the capabilities to debug this device much further. I have tried basically anything that I can think of, but without further experience in mobile development and lacking equipment like a proper UART adapter, I am now pretty much out of options.
I would say that I can rule out the SD-cards, as I have probably flashed 20 different ones (yes, I do have a lot of 8GB *very* slow ones), some of them using Etcher which verified them as correct. Only android is booting reproducibly on different microSD cards.
I managed to get two snippets of useful data using the serial connection of my Raspberry Pi, I just got garbage the other times I have tried. I don't know what Image was on the SD-card at that time. When I have eMMC enabled, Serial output gives me this: https://pastebin.com/QKsgxc7y Without, I get this output: https://pastebin.com/asPs5Kgz


I really need some help here, I can't work without something that does at least a little bit more than my ancient Eeepc