Windows 10 preview

[Paritosh Raj]

Hello frnds..
I have Lumia 535..
I installed windows10 Mobile preview build 10166...
I don't get sound or ring in case of notification come..
Now if I go to installed preview build 10512 os...
After download update..during installation it took error ,msg on screen- an important file is missing and restart downloading update and result same ..it occurred 4 times..
Pls help..

 

[juanitoriv]

Use the Windows Phone Recovery tool to go back to 8.1 and re-enroll in Insider. It's a fairly painless process. Make sure all your stuff is good and charged up first though.