The newest kernel version of R4i Ultra&R4 Ultra is 1.56 , released in 09 25 2010. R4i and R4 Ultra  use the same kernel, supports multi-language. Please select the language that you want, and download it. More language kernel will be released soon. If you have not known how to use R4 Ultra and the kernel package, please chick here to get the guide.

R4i fw update for 3DS 2.1 Download 2011-08-22

R4i fw update for 3DS Download 2011-04-11

AKAIO 1.86a for R4i Ultra Download 2011-04-11

AKAIO 1.81 for R4i Download

R4i update fw for DS 1.41 Download