Yes if you be careful.
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not for the original r4 but if you have the r4 ultra or r4 sdhc or some other r4s then yes
to use the r4 card, you also need a MicroSD card, which is used for game and r4 kernel loading. 1. download the latest r4 kernel from official website, it is a zipped patch. 2. Unzip the patch, you can get several files. 3. Copy all files to the root directory of the MicroSD card. 4. Download some games, unzip it, and put them to the root directory of the MicroSD card. Insert the MicroSD card into the r4 card, and put r4 card into the console, then you can start to play games.
R4 card is used to play games by downloading from internet. you can download as much games and put it in r4 card depending on the size of R4 card(2gb, 4gb etc).u can even listen songs on it.(u can see it on youtube that how to put songs on R4 card).u can store pics in it(use youtube for it).u can theme ur r4 card(youtube)u can watch movies and clips on r4 card(youtube) hope u enjoy. i hope i helped.BY; Saad Ashraf (saad 2 sid) thnX
NO
R4 has released a firmware update. So just put the newer one on your r4 card and it will work.