when you download the file,extract it to your sd card which will have to be connected to your computer,it should ask you will it overwrite or replace just click yes,with regards to the 1.4 update,i have'nt got that particular card but i will look into it for you,a read me file did'nt come with the download by any chance,i know with some cards the 1.4 update is done on a ds before it goes into the dsi