Software update virus m7

[AC Question]

Sold my htc one m7 to a friend. She got a message for an update and clicked on it. Then her phone started laughing. Now it is just powering up all the time. It goes no further. It shows a red triangle with an exclamtion and does that till it dies. I tried resetting. Factory resetting. I can get nowhere. I'm assuming she got a virus. Is there a way to fix? Please help. Thanks!

 

[B. Diddy]

Welcome to Android Central! It literally started laughing? Was there any message on the screen?

Try booting into Recovery Mode and factory resetting from there: https://support.t-mobile.com/docs/DOC-6526