How to remove ?= from url?
It will sound silly but it can help you.
Go to /admin/config/search/clean-urls 
you will get example.com/?=admin/config/search/clean-urls in your address bar
remove ?= from address bar so that your url become example.com/admin/config/search/clean-urls
press enter
Now you will get a check box 
tick that box and save configration.

May this Helps you.