Hey!
I've been doing some tests with mixed results. If I clear (all 0s, with proper CRC16):
Range {Start = 0x0480, Length = 0x180}, //device cert (if missing, atmosphere shows error 2105-0584)
Range {Start = 0x2440, Length = 0x400}, //gamecart cert (if missing, atmosphere shows error 2011-0301)...