If you mean this manager it’s a tool to create the initial vfio configuration for the passthrough. You can do it by hand.

You can try one of the phones that are supported by Ubuntu Touch. I don’t know how good it runs but there are several cheap (= old) phones on the list.

I’m pretty sure default Android runs almost always on F2FS.

The OS splits memory into pages and assigns the pages to applications. A page fault usually means one of two things:

• hardware fault
• programming error

You can check your memory with Memtest86. Some LiveCDs come with it. If it’s a programs fault you can only try other software if possible.