DSTTi users could download the DSTTi 3DS Firmware Update here.It has been confirmed by many users that the firmware works perfectly.The guy who released the news said he got the info directly from DSTTi team,he also said that this firmware has already existed since the 26th of march 2011...but the dstti team still has not released the news on its official website yet. Quote' The DSTTi flash cart has received a firmware update, allowing it to run on the current firmware of the Nintendo 3DS system. This update should be applied from a DS, DS Lite, or DSi/XL system that the DSTTi currently boots from.'
What's more, this DSTTi Firmware Update For 3DS does not support Nintendo DSi V1.4.2 right now, I think the dstti team is working on this now, a new updating patch will be released soon