Then "mega" likely refers to the file hosting service Mega.nz. So putting it all together, the user is probably asking for a guide on how to download and install a Nintendo Switch firmware update (version 108, maybe v5.0.0 or similar) from Mega. However, I should be cautious here. Nintendo Switch firmware updates are crucial for security, and distributing or modifying firmware can violate their terms of service. Plus, downloading system updates from third-party sites like Mega could be unsafe and might contain malware.