http://gbatemp.net/threads/flash-carts-and-dsi-3ds-updates.315784/my 3ds xl firmware is at 5.1 would i need a ds to update the r4i flash card?
Just make sure the r4i gold 3ds rts card is from r4ds.cn and the site has pre flashed for you, check here, should be this one: http://www.dsflashcart.com/r4i-gold-3ds-wood-r4i-3ds-flashcard-for-ds-dsi-3ds-p-248.html so you don't need to update it by yourself when you receive it.
RTS was added to Wood itself, even if the sticker/box doesn't say RTS, it can use it. It was just a label change, and it happened recently so many sites haven't updated their pictures.
If you can run the cart, you can update the cart.would i be able to update the r4i if its already on 3DS v4.5.0-10 and DSi v1.4.5?
Just make sure the r4i gold 3ds rts card is from r4ds.cn and the site has pre flashed for you, check here, should be this one: http://www.dsflashcart.com/r4i-gold-3ds-wood-r4i-3ds-flashcard-for-ds-dsi-3ds-p-248.html so you don't need to update it by yourself when you receive it.