it broke my cart saves so stick to 1.6 i had to format eveything 3 times so beware :-[ :-[ :-[ now my cart is fixed again so dont update at www.r4i-sdhc.com
www.linfoxdomain.com/nintendo/ds All your firmware needs. Also, make sure you are using the correct firmware for the correct cards, there are so many copies out there labelled "R4" that it's likely you may have got the wrong one.
^^ ok so the cards themselves aren't too bad, not the best but they aren't bad... It's more the fact that they had to steal another companys name