Many third-party websites offer NSP downloads of Fate/Samurai Remnant for use with emulators or custom firmware (CFW) systems. These downloads typically include the base game NSP, update files, and DLC packs. For example, one source offers the complete package with the base game, Ver. 1.0.1 update, and three DLC packs as a single download.
Once you have the NSP , UPDATE , and DLC files, here is the standard procedure for both custom firmware users (Atmosphere) and emulator players (Ryujinx): Fate Samurai Remnant Switch NSP UPDATE DLC
DLC 3: Record's Fragment: Bait and Switch / Zhao Yun crossover and DLC packs. For example