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dsiware will likely be able to be installed
and there's a pack of 804 DSiWare titles out there, so it's not hard to get them, don't bother trying to change a cia back into a dsiware file
This worked for me (albeit not with Sonic) and I gotta say, thank you for the tool! I have that archive of 804 DSi games/apps and I was honestly afraid I'd never be able to use them on my 3DS.
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi