Hmm, you've still got boot.3dsx in the SD root? There's really on like two things required for it to work... 1) boot.3dsx in the SD root and 2) something (usually homebrew_launcher_dummy or Download Play iirc) set to title takeover from Rosalina
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