R4i sdhc not working after dsi firmware update?

if your r4i sdhc is this one : http://www.usar4.com/r4isdhc-3ds-r4isdhc-rts-3ds-flashcart-for-2ds-3ds-xl-3ds-dsi-ds-lite-p-4.html , it can work on the latest firmware v1.4.5 E . just follow this tutrial to update it to the newest firmware V1.79b : http://www.usar4.com/blog/how-to-set-up-the-r4i-sdhc-rts-3ds-flashcart-kernel-to-the-latest-v1-79b/ if it still get an error message , u need to formate the micro sd card or change a new mirco sd card .

because your r4i sdhc 3ds card is an old version and can not work on the latest dsi V1,45 firmware, so the card is not working after you updated your dsi console. if your card is this one http://www.dsflashcart.com/r4isdhc-rts-3ds-flashcart-for-3ds-xl-3ds-dsi-dslite-p-280.html you can try the update fguide here http://www.dsflashcart.com/blog/how-to-update-r4i-sdhc-3ds-v4-5-and-r4i-sdhc-rts-flashcart-to-work-on-3ds-v5-0-0-11/ if still not working, i am afraid you have to buy a new updated card which can work on your dsi caonsole, recommend the r4i gold 3ds or supercard dstwo.