In mathematical terms regarding probability of game NSP being safe: $$P(\text{safe NSP}) = \frac{\text{Number of safe NSPs}}{\text{Total number of NSPs}}$$
The use of NSP files for game distribution outside of the official eShop raises several questions regarding legality, security, and ethics. Officially, NSP files are meant for developers and publishers to distribute content through the Nintendo eShop. The creation and distribution of NSP files for pirated or unauthorized content can infringe on intellectual property rights, similar to piracy on other media platforms. fc 25 switch nsp
FC 25 requires a recent System Firmware version. Ensure your console is updated to the latest compatible version to avoid "Could not start software" errors. In mathematical terms regarding probability of game NSP
Ensure your signature patches (sigpatches) are up to date so the system can verify the digital package. FC 25 requires a recent System Firmware version