I tried installing the Windows 10 technical build 10166 on my Lumia 730...originally at windows 8.1(latest update)....the error i was getting is that the phone was trying to install the update on the sd card...and it didnt go through....i dont understand why the phone was installing the update on my sd card insead of the phone memory.........i would also like to knw how much minimum phone meory is required to install the build