Ishopvideogame provides the free solutions to solve the problems of how to update the R4 and R4i kernel for the game lovers.
How to update the R4 kernel:
download the corresponding language kernel,you will get 3 or 4 files after compressing the files, then copy them to the MicroSD (must be in root file)
moonmemo—momeory book
moonshl2—multi-media
R4iMenu—system menu
R4.DAT—system file
_DS_MENU.DAT—system [...]

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According to the official website, R4 SDHC Kernel upgrades to v1.29 on Dec 17, 2009 and R4i-SDHC kernel updated to V1.13b on Dec 12, 2009. So you can go to ishopvideogame to get free R4 and R4i kernel download service.
The R4 and R4i cards download url on ishopvideogame:  http://www.ishopvideogame.com/r4-series-cid-158.html
R4 SDHC Kernel download url are [...]

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Now the current firmware version of r4i series cards have been upgraded, like r4ultra r4i, r4i sdhc (red r4i), r4i gold. Now the current firmware versions are as follows:
r4ultra r4i : r4i v1.55b
r4i sdhc (red r4i) : r4i v1.12b
r4i gold : r4i v1.30b
Ishopvideogame now provides the latest kernel download as follows:
Kernel download url: http://www.ishopvideogame.com/r4i-for-dsi-cid-167.html
r4ultra r4i:
English [...]

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