You can't simply delete hiberfil.sys through File Explorer. Even if you enable hidden files and protected operating system ...
How-To Geek on MSN
How to clear system data on iPhone (the only way that works)
Now that you've backed up your iPhone, you can erase it. Go to Settings > General > Transfer or Reset iPhone. Select "Erase ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results