I got an r4 3ds card and loaded the software and a couple games at that time and it worked. Now I get it out to give to my son for his birthday and load more games on to it and i get an error has occured hold down power button to shut off device and check owners manual
it seems that you need to flash your card.You can try to use the latest firmware v1.44,if still cant work,then you can follow this guide to recovery your card : http://www.digitopz.com/flashcart-help-center-ezp-17.html . Good Luck !
Can you do a format of your sd card, and then put the latest wood firmware and the game roms in your SD card. See if it works.
it might not the if he is using the 3ds or the dsi a new firmware update issued prevents this card from booting i hope they release a fix soon mine is as dead as a door nail
http://www.r4town.com/news/80/R4i-SDHC-V1.45b-released-for-R4i-SDHC-3DS-card.html http://www.prlog.org/11703000-r4-3ds-kernel-update-to-v146b.html http://www.r43dsguides.com/tag/driver/