You must have the latest sigpatches installed on your SD card, or custom software like Tinfoil/DBI will fail to install or launch the NSP. Server Protection: Ensure you are using Exosphere/Atmosphere DNS MITM to block Nintendo servers. 💿 Methods to Install the Patched YouTube NSP
Note: You may see a warning about an or "Unsigned Title" . This is normal behavior for a modified app; press the corresponding button on your Switch to bypass the warning and confirm the installation. youtube patched nsp install