I'd rather just use a flashcard than install custom firmware. I think the time bomb can be fixed by rolling back the date on the DSi, am I correct? Besides I'll probably just buy a more expensive one in the future. So the flashcard above will work with 1.4.5U, that's good to know thanks.
I bought a DSi from eBay hoping to use my old Acekard2i but it's updated to 1.4.5U and won't work so I did a quick search on Google and found this flashcard on newegg but I need to know if it will work on my DSi before I buy it.