My lumia 640xl not starting up

[Arif Banda]

I updated my device to Windows 10, and it was working good till I received last update.
So I downloaded the update and device ask me restart windows to set it up.
Since that it never starting up,when I turn it on automatically turn off.

 

[a5cent]

This explains the problem and the solution:

https://arstechnica.com/information...ows-insider-program/?comments=1&post=33426267

This solution works for 99% of people. If it doesn't work for you report back here.