If you are looking to customize your Nokia G300 without a custom ROM, you can try these non-invasive methods: Custom Launchers: Use apps like Nova Launcher to change the visual interface and add new features. Debloating: Use tools like Universal Android Debloater
Due to the lack of an open bootloader, there is no "official" LineageOS or Pixel Experience ROM specifically built for the G300. However, the device supports , which opens a different door: Generic System Images (GSIs) . nokia g300 custom rom