Actually depends on the company which makes your r4/i cartridge. The website will both be written on the r4/i or the box in which you receive the r4/i. Go to the website and download the latest firmware in whichever language you want in the download section.
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The R4i will work in all DSis with the 1.0-1.3 firmware. It will NOT work it your DSi has been updated to the 1.4 firmware.
An r4i can let you back up the games that you already have (please note an r4i only works on a dsi and dsi XL if you do not have a dsi or a dsi XL you will have to get a normal r4 but do not be sad a normal r4 cando everything an r4 can).
yes you can but you need to download a software called r4i update
The r4i gold card is much better than r4i ultra card. The r4i gold is most popular in the world. it can work on Ninendo 3DS, DSi V1.4.4 and DS console. the r4i gold firmware keep on update to support latest 3DS system update. But the r4i ultra card is a very old console. it is now out of production. And as lack of firmware update, it can only work on Nintendo DSi V1.4.1 and DS lite console.
no mate ive bought the dsi XL 1.4.1e for my brother and also bought the r4i ultra and it seems that Nintendo have intentionally put the new firmware to prevent others from using the r4i chip hope this has helped