If you cannot access the settings menu to update, you can attempt a recovery:
Have you successfully flashed your Nokia C30? Share your experience in the comments below. Nokia C30 Firmware Download
Regional rollouts can be slow. Wait a few days or try clearing the cache of the "Google Services Framework" app. Download Interrupted If you cannot access the settings menu to
Use a tool compatible with Unisoc (SPD) chipsets, such as the TSM Tool Pro for factory resets or general SPD flash tools for ROM installation. Nokia C30 Firmware Download
You may need to flash official firmware on your Nokia C30 for several reasons:
Always scan downloaded files with antivirus software.