How to upload windows10 to windows 8.1 for mobiles
Sorry, I really don't understand what do you want ? Explain please
Hello Velpula, and welcome to Ten Forums.
If you mean to update your Windows 8.1 Phone to Windows 10 Mobile, then the tutorial below can help show you how to.
Windows 10 Mobile Insider Preview for Phones - Update to
Windows 10 for Phones hasn't been released yet.