As we know that only revision C r4i gold 3ds card can work on the latest 3ds V4.5.0-10 and DSi V1,45. if you bought the r4i gold card many days ago and your card can not work on them, then you need to either wait for the update patch or buy another new latest version card. and today, the official site has released a update patch for some r4i gold cards (not all of them).
As the title says, today r4i gold 3ds card (the r4i gold card must be this one from r4ids.cn : R4i Gold 3DS Wood R4i 3DS flashcard For DS DSi 3DS ) has released a new update patch for the card to make more old r4i gold cards able to work for the 3ds V4.5.0-10 and dsi V1.45.
Here is the details from the official site
The new patch for 3DS V4.5.0-10 & DSi V1.45 is releasing!(2013-01-06)
This patch is only for the revision (C, A, 9) 3DS cards, we are still working on those old revision cards(and few revision "c"), will keep it updated on our site soon, thanks for your patience...
Download: new patch for 3DS V4.5.0-10 & DSi V1.45
The r4i gold update method, pls check here: How to update r4i gold 3ds card for 3DS V4.5.0-10 and DSi V1.45
After this patch, there are still some old cards can not work on the latest 3ds, hope the official site will release more update patch soon.
Do yourself a favor, don't buy crappy flashcarts.