Bios: Nintendo Switch [best]

This process gives you the functional equivalent of a BIOS, but it is legally grey (only acceptable for personal backup/emulation in some jurisdictions).

Beneath the Joy-Cons: An Analysis of the Nintendo Switch System Firmware (Horizon OS) and Boot Process bios nintendo switch

: This allows you to replace the standard Nintendo logo with a retro-style startup screen, often used with custom firmware like Atmosphere or Hekate. This process gives you the functional equivalent of