Nokia does not publicly host full firmware files, but they provide OTA update packages. You can capture OTA links via logcat, but this is complex for beginners.
Stock firmware is the official operating system software that comes pre-installed on your device. It is specifically designed by Nokia (HMD Global) for the hardware specifications of the C30. Flashing stock firmware restores the device to its factory state, removing all user data and third-party modifications.
While it handles basic tasks like web browsing and social media smoothly, the Unisoc SC9863A chipset struggles with heavy multitasking or graphic-intensive games. Some reviews noted occasional stutters even with 4GB of RAM. HMD Global two years of quarterly security updates