DSi not working

I'm having a problem with R4ultra for the DSi. I can't get it to work: i have used firmware 1.55, tried changing FAT settings, and tried earlier versions of firmware, all with same message. When i click on button on DSi for R4DS Ultra it comes up with 'An error has occurred ... refer to Nintendo DSi Operations manual.' There is nothing obvious in the manual. Can anyone help?
(Cheers Loonylion)

What firmware does your DSi have?
The 1.4 DSi firmware blocks flashcarts.Do you have the R4i version of the ultra?http://gbatemp.net/index.php?showtopic=175010&st=0&p=2200119&#entry2200119
This thread offers a fix for the R4i Ultra.
Here:
http://www.mediafire.com/download.php?yl2wy2ntkmzYou need a DSi without the 1.4 firmware, or a DS or DS Lite to run the update.

I have been warned off the 1.4 firmware, nd i am using the 1.55 version from the R4ultra ite. Yes it'sthe R4Dsi version of the unltra that i have. Any ideas?

Take the R4i out of the DSi. Turn on the DSi and look at what firmware version it is. (Top screen, bottom edge).

1.4E

then you must update the flashcard.

Unfortunately you cannot update your flashcard on your DSi because it is at 1.4You will need to use a DS/DS Lite or a DSi with 1.3 or less.

Thanks for help, but managed to get sorted using following:http://www.r4ds-ds.com/pages/R4i-%26-R4-Ultra-Kernel.htmlGo to part that says [u]notice[/u] and follow instruction. The instruction looks weird but it does work!