Some users turn to “shared keys” found on Reddit or Discord – but this is copyright infringement, and Nintendo has successfully sued distributors of such keys.
Yes – but you still need prod.keys and firmware. There is no BIOS file for Switch.
Please keep in mind that modifying or updating your Switch's BIOS may void your warranty or cause issues with your console. Always exercise caution and follow official guidelines when performing such actions.
When updating your Switch's BIOS, make sure to:
to extract the system software directly from your console’s memory.