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Interesting. Although some system apps from DSi do work on 3DS. I tested some. (you just have to launch them with FBI, because only the web browser showed up on Home Menu. Everything else is a system app and I guess Home Menu only expected DSi system apps like DS INTERENT and DS Download Play to be installed so it hides all DSi system apps) I recall DSi Web Browser, eShop (though it gets a connection error when it connects to internet. Probably because missing info from TWLN partition?), DSi Sound, and DSi Camera app booted just fine. (and aside from eShop, they operate just as they would on a DSi)
DSi System Settings almost boots. But gets a black screen error. (but the black screen error isn't the one that occurs from CTR Arm9. It's the DSi Black screen error. I even hear the DSi system settings menu music for a quick instant before the error pops up) That also is probably because of missing data on the TWLN partition that a real DSi normally has but is not on a 3DS.
DSi Launcher (what I assumed was the Home Menu itself?) doesn't boot at all. It crashes with black screen error while still in CTR mode or during the transition into TWL mode. Maybe because boot2 doesn't work with it or it's not encrypted in a way 3DS was expecting. That or also because of missing stuff on TWLN/hardware compatibility) I'm just throwing out guesses at this point.
But say I replicated 99% of DSi NAND on 3DS TWLN partition. Could that improve the chances that Boot2 from DSi would work on 3DS if everything a DSi normally has is present on the 3DS or is there some hardware differences or clash with how TWL_FIRM sets things up that gets in the way?
I can imagine one thing is the fact that normally Slot-1 is not enabled in TWL mode if a DSi app was booted (and visa versa if a Slot-1 TWL title was booted), so DSi Home Menu might have issues trying to access Slot-1 since the 3DS TWL_FIRM would assume it's a normal DSi app and there be no Slot-1. Unless DSi Boot2 could possibly resolve that.
Are you able to get Pictochat? Everyone loves that 0u0 Would it be possible to extract it from the DSi and inject into the 3DS?