Homebrew What is the "programID" in regionthree?

Are you talking about the argument passed to NSS:RebootSystem? Thinking of using regionfree to boot different titles?
 
Yeah, that.
0x00100180 activates rebootsystem and clears the FIRM permabuf. I think what you're looking for is 0x00000002, which is the game cart mediatype.

Edit: If you ARE trying to access the SD card for any sort of .3DS launching, changing the 2 to a 1 in the second value will change the mediatype to SD.

Sources:
Mediatypes
shared.s
NS
RebootSystem
 

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