See the comment cousin of yours. I didn’t find much, and what I did find was mostly stuck in PDFs.

Edit: here is one article discussing a specific Shanzhai phone. https://drprem.com/tech/cect-t32-apple-cant-approve-this-clo...

I’m pretty sure it’s Windows CE and not WinMo, most reviewers weren’t concerned about the difference. WinCE was the core of WinMo (well, until windows phone), but it was easier to just take winCE and skin it since they didn’t really want the WinMo UI (this phone has an iPhone copycat UX).

Here is another one with WinCE listed as the OS: https://en.wikipedia.org/wiki/Meizu_M8