For Chrome issues to be sure your HSTS is clear do this:
1. Open a new tab in Google Chrome
2. Enter this address in the address bar:
chrome://net-internals/#hsts
3. Type the domain name in the text field below “Delete domain”.
4. Enter domain name: xiaomi.eu
5. Click on the "Delete" button
6. Reload page of xiaomi.eu and you should be good to go!
For Firefox users:
Try to rename/remove
SiteSecurityServiceState.txt in the Firefox profile folder with Firefox closed.
You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the
about -> Profiles page.