I heard that ONDS/DSi/DSL fixes the original DSTWO, not the DSTWO Plus (prty much just a DSTWO with a gateway 3DS simulator)
but i'll try it
(I have weird abreviations. ONDS = Original DS; DSL = DS Lite)
yea no idea, i read somewhere you could do it when my weird rom cart messed up but couldnt afford a ONDS or NDSL so just got a DSTWO, that was back in 2011 though