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Awesome! Might be time to upgrade from a 3B.
Updating your switch wont stop you from being able to enter RCM mode. If you set up your EmuNAND correctly, you should be able to run a system...
This is caused by the pins in the switches cartridge slot making contact with the pins on the back of the cartridge. This is perfectly normal.
I think I have it but i cant post a link as I just made this account :(