Well I sent this question to the Chuwi help email address,
I have bought one of your Larkbox with windows 10 installed on the eMMc, but I have also put a M.2 SSD in the slot and want to put Ubuntu on this for a dual boot system, I have heard some horror stories about bricking the system with changes in the BIOS, so do you have instructions for this, or any pointers I need to know on having and setting up a dual boot system…
And this was the answer I got back today……what the hell…???. How on earth does this help me…….
Could you send us the photos or video about your problem? We need more details about your machine problem.
Please send the screenshot of serial number on the back of your machine to us for confirmation.”