If your goal is to "develop text" (such as translating games or changing system fonts), this requires Custom Firmware (CFW) Atmosphere ConsoleMods Wiki
Practical guidance:
On the Switch, this isn’t just a "basic input/output system" (BIOS) in the traditional PC sense—it is a fully realized operating system known as . bios nintendo switch
If you are a tech enthusiast, the only legitimate method to get the equivalent of a Switch BIOS is to dump it from your hardware: If your goal is to "develop text" (such