My K790i suddenly turned off and was not turning on. When I tried to start the phone it came up to the start animation then the screen kept blinking white/ black. I tried SE update service but since I had latest firmware it did not flash the phone.
Finally I used XS++ 3.1 (BTW big thanks for the software and this guide) to flash the latest firmware again. The phone started working but now after a few weeks it has again turned off and is not starting.
What could be the problem with the phone?