Thank you so much for your reply and for the welcome!Hello @GOT85 and welcome to GBATemp!![]()
As for your question, sysnand /or emunand files & data can only be used on the original system and not others, but stuff like backed up saves (with JKSV) can work on other systems just fine.
I thought it was like this! Sin! so I have to redo the mod from scratch? do you know a simple guide? I'm not very knowledgeable 

"Sin"?I thought it was like this! Sin!
Yes, since it's a new system.so I have to redo the mod from scratch?
Read & follow the guide here.do you know a simple guide?

https://gbatemp.net/threads/switch-noob-paradise-ask-questions-here.488277/unreadHi everyone! I sold my modified switch but I have another one that I would like to modify, it's a V1 2017, before selling I backed up the data, to modify the other one (always v1 2017) can I simply copy the files of the old one?