Hi there! Thanks for reaching out. I understand that you're having trouble opening sites and videos on your Xiaomi mobile using UC Browser. I'd like to get a few more details to help you better:

1. When you say sites and videos won't open, do you get any error messages or does the page simply fail to load?
2. Does this happen with all websites and videos or only specific ones?
3. Have you already tried any fixes or troubleshooting steps?
4. Is your internet connection working well otherwise (like with other apps)?

Once I have a bit more information, I can guide you through some steps to fix this issue. Looking forward to your reply!

How to update the UC browser

Thanks for asking! Updating UC Browser on your Xiaomi device running Android 10 is straightforward. Here's how you can do it step-by-step:

1. Via Google Play Store (recommended):
- Open the Google Play Store app on your phone.
- Tap the Search bar and type “UC Browser.”
- If an update is available, you will see an Update button next to UC Browser. Tap on it to download and install the latest version.

2. Manual APK update:
If you prefer or face issues updating through the Play Store, you can manually download the latest UC Browser APK from the official site:
- Visit https://ucbrowser.net/download/ using your current browser.
- Download the latest APK version for Android.
- Before installing, ensure that “Install from Unknown Sources” permission is enabled in your phone Settings > Security.
- Locate the downloaded APK file and tap it to install.

3. Restart UC Browser after updating:
Once updated, restart the browser for the changes to take effect.

For best security and performance, I recommend updating regularly via the Play Store when possible. Let me know if you'd like me to guide you through the update process interactively!

Are you satisfied with the solution I provided?