That is why it is best practice in those types of scenarios to make a NAND backup and stay offline until you need to go online. It is still not a viable long term option due to the limited amount of times you can write to the eMMC.
I actually wanted to see if some of the devs who work closely with the console could give an estimate. The limit may be realistic or not, only one way to find out.
Just to add my experience. I had SX os and was playing “backups” of botw and dk for a few weeks and ran minimal homebrew. I deleted my WiFi connection so it would stay offline. Yesterday I decided to go legit and I proceeded to reset the switch without deleting save data and formatted the memory card. I connected to WiFi and paid for and downloaded the games I was playing and the previous saves loaded right up. So far I have no issues and I am not banned. I even tried playing fortnite and paladins online. All is running smooth, and I hope it stays that way. So, in conclusion I think depending on how you modify your switch a reset may be all that’s needed to go back online.
Bought a switch a few days ago. Never connected to online, backed up nand before doing anything, updated to 5.1 using ChoiDujour and installed autoRCM. I've played nsp's and modded games with layeredFS. If I restore the nand I shouldn't have anything to worry about right? Other than if they can maybe detect RCM or injecting the payloads.
Use the tool called hekate to back up your nand. It saves it on SD card. If your SD card is not big enough, it saves it in parts so you can move them to PC in between each round of copying. It can take a while, several hours if your SD card is slow. You should still do it.
There have yet to be any reports of a ban with a restored clean NAND here. That does not mean we can be 100% certain there will never be. There is always some risk becuase we don’t know what N knows and what evidence might still be left behind.
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