In my case, major problem is I can’t enter android DNX mode.
I refer to last reply in “http://techtablets.com/forum/topic/pc-does-not-recognize-tablet-in-dnx-mode/”
For installing Mirek’s rom, I connect USB keyboard to tablet, press DEL key during truning up tablet and select os image ID as android and enable dnx.
After install Mirek’s rom, to install windows follow this way “http://techtablets.com/forum/topic/teclast-x98-pro-windows-10-image-released-and-tutorial/”.
Sorry for my bad English, and don’t blame me even if some problem happens.
