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You don't need to reformat the r4i gold card. You just need to format the MicroSD card, and reinstall the r4i gold kernel and games. Nothing about the r4i gold card.
R4i is illegal b/c r4i is a device for pirated games which is stealing from the companies that created the games.EDIT: The R4i was legal, because you could use it in legal fashions. However, selling, advertising or importing R4i and all similar cards is now illegal in the UK. This is a recent ruling, subject to a pending appeal.
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).
of course, new r4i v1.6 kernel can work on all below version of r4i card, including r4i v1.4 kernel.
r4i gold and r4i sdhc card are most popular in players. both of them can support 3ds, dsi and ds lite. but personally, I think the r4i gold card has better compatibility.