We have seen several users struggling to update to iOS 13 with an ‘Unable to Check for Update’, An error occurred while checking for a software update.” message which persists into iOS 13.1. The easiest way to resolve these issues is to restart your iPhone. Apple suggests Try updating your device again using the same network. If you still see one of these messages, try updating your device using another network or update your device with iTunes. If the issue happens again after trying to update with multiple networks, remove the update.

Update with iTunes or Finder (Catalina)

If all else fails, try updating via iTunes (or the Finder app if you’re running macOS Catalina). Here’s how to do that:

  1. Connect your device to your computer.
  2. Open iTunes or Finder and select your device.
  3. Click Summary, then click Check for Update.