System not responding when phone starts

i have big problem with my htc m9. more times i give error "system not responding" when phone starts. and after boot, i can not access data usage menu everytime give me error. And big problem mobile data and wifi every time down. mobile data is on and connected i see but no data and i can not access anywhere.

and today i want to unlock my phone but i give error and i couldnt unlock.

i think all of them is software problem so how can i flash orjinal software ?