Q: How to fix if touchscreen of iPhone 6 is not responding after updating last version

Hello jvfs2016,

Sorry to hear that your iPhone 6 screen is not responding when you touch the screen. I know you have a done a few things but lets go over what others things you can try. 

I would make sure that you do not have a screen or a case on your iPhone that would block access to touching the screen. Also, it would be a good idea to clean the screen if you have not done so already. If that does not work, then you will want to contact Apple Support for further assistance. Take a look at the article below to compare what you have done and what to do next. 

Get help with the screen on your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT203039

Take care