Step 1. Boot your switch with
hekate_X.X.X.bin (grab it from here if you don't have it.)
Step 2. Tap
Step 3. Tap
Step 4. Tap
Step 5. Tap
Step 6. Tap
Close once the process is finished. This will take awhile, 10-30 minutes depending on your SD card.
Step 7. Verify
Enabled! is shown, then tap
Close. If emuMMC says it's disabled, tap on
Change emuMMC, select your
SD RAW1 and it should be enabled after that.
Step 1. Hook your SD card up to your computer (using Hekate, sd card reader, etc.)
Step 2. Copy your
Nintendo folder that's on the root of your SD card into the
\emuMMC\RAW1 folder on your SD card.
Step 3. Plug your SD card back into your switch and boot with your custom firmware's payload.