Do you have any tutorial handy?
Check out ChoiDuJourNX.
https://gbatemp.net/threads/choiduj...ller-homebrew-for-the-nintendo-switch.513416/
Get a firmware from either a suitable XCI file, or from *cough* that X bin place.
Put the folder on your SD card.
Put the .nro for choisdujour in your /switch folder.
Make sure fullsvcperm=1 is in your hekate ini file
Start hekate, run the installer
Pick the folder containing the update
Press the start button.
It will install autorcm for you, to ensure you never run ninty's boot loader, and burn your fuses.