hello everyone, did you update to 1.4.3 and now your r4i doesn't work? well i found an 1.4.4 update!,
kernel link:http://www.r4i-sdhc-3ds.co.uk/2011/08/how-to-upgrade-r4i-sdhc-v1-4-1-and-v1-4-2-card-for-dsi-v1-4-3/

copy and past link to the address
bar and hit the enter key, it should bring you to a page that has steps, follow the steps and ta da! your r4i is now 1.4.4!

you need: a ds below 1.4.3 and a pc hope i helped you