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There's been a few claims of Switch 2 hacks and custom firmware lately. Most recent is an alleged "nand explorer", which is currently impossible. The UFS storage is encrypted, so direct access won't work without the keys, and there is still no software exploits to access the storage or get the keys.

The reason you might see a Switch 2 with "custom firmware" is due to images and videos being displayed in the Album. It is possible to insert custom content by signing images and videos so the OS accepts them.