XCI is a cartridge dump; NSP is an eShop dump. For updates, you always want an Update NSP , as updates are never distributed via XCI.

What is your Switch currently running?

For users utilizing custom firmware environments to manage legally obtained backups, manually applying an update involves installing the specific update NSP:

: Bosses were rebalanced, and the "Red Moon" difficulty mechanic was made less punishing for players who die frequently.