My R4i Ultra won't work on my new DSi. HELP! I have tried everything!

I really need help with my R4i Ultra. I was supposed to buy a normal R4i....My brother has the same R4i Ultra but he got a file and it worked on his DSi...He tried putting the file onto my R4i Ultra but it made no difference! HELP!

you have to use a DS or non 1.4 DSi to update the r4i before it will work on a 1.4 DSi