The Xiaomi smartphone notifies us when a software update is available, but if we missed the update notification or closed it, we can always manually check the availability of updates.

Android 10 (MIUI 12.0)
Step 1:  Open the  Settings
Step 2:  Tap on  About phone
Step 3:  Tap on  MIUI version
Step 4:  Tap on  Check for updates
  1. Open the Settings
  2. Tap on About phone
  3. Tap on MIUI version
  4. Tap on Check for updates

Xiaomi Instructions