lumia 640 xl windows 10 model mobile, sd card no showing issue

By | December 22, 2016

In my model Lumia 640 XL files windows 10 mobile app and Whatapp is not working and i am unable to find my SD card. i am unable to turn off my mobile. i have tried to reset the mobile also.has issue with WhatsApp. WhatsApp application crashes after running any video 2, 3 seconds