If you want to play new games you have to update firmware, if you want to go back to 3.0.0 firmware use ChoiDujourNX it is eay to use all automated! https://gbatemp.net/threads/choiduj...ller-homebrew-for-the-nintendo-switch.513416/it works perfekt on 3.0.0
but how can i play 3.0.0+ Games (Mario Odyse) just update to last firmware online ?