I agree, it does look complicated.. I read it multiple times and i still messed up my NAND and my switch was only going into BLUE screen. But i tried again and it worked perfectly fine (im on 4.1.0 and now have exFat installed on stock)
Basically what you are doing is
- Backup your NAND, extract 1 file from it
- Update that extracted file with exFat drivers
- Injected that updated file back to your NAND
When you boot up your switch, it will read your NAND and see that you now have the exFat drivers
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Just FYI, I am on 4.1.0 and i messed up my NAND the first time, I used Wonder Boy (from google) and my switch was giving me Blue Screen, i went into RCM mode and restored the corrupted file
Tried again with Donkey Kong Tropical Freeze and worked fine.
The reason i didn't use Kirby because on this
list, it said "[When installing day 1 update/ patch it needs 5.0.0!] - ^Update 4.1.0 on cartridge^" ... i did'nt understand that and didn't wanna take chances