He didn’t install it on his Switch. He was smarter than that. Instead, he mounted the NSP in an emulator—Yuzu, sandboxed, with no network access. He even ran it inside a virtual machine inside another virtual machine. Paranoid? Maybe. But the file had whispered to him in ways he couldn’t articulate.
The file in question appears to be related to an update for "Batman: Arkham City". Let's break down its components: Batman Arkham City -NSP--Update 1.0.2-.part1.rar
Users who download and use this file should be aware: He didn’t install it on his Switch
While the Switch 1 hardware struggles with texture streaming, tests on Switch 2 hardware via backwards compatibility show significantly improved loading times and a more consistent 30 FPS lock, effectively "brute-forcing" the original code for a smoother experience. He even ran it inside a virtual machine
Thus — this .part1.rar file is containing an NSP update file.