R4i-sdhc 3ds rts, from its official site, declared that new patch for support 3DS V6.2.0-12 has been released, and R4i sdhc rts has become the third card that support 3dsV6.2 (the other two is Supercard dstwo and R4i gold 3ds), however, it is also added that " certain model only", to hell with the certain model. Nevertheless, it is worthwhile to have a try.
R4i-sdhc 3ds card should be conformed having updating successfully, then you can update your 3ds to 3ds V188.8.131.52, or your R3i sdhc card might be ruined.
Please update your r4i sdhc rts card in the following way.
1. Download the latest from this site: http://www.digimartz.com/r4isdhc-3ds-rts-upgrade-revolution-for-dsi-3ds-lln3dsndsi-xlndsindslnds_p1103.html
2. unzip it, open the folder and you will get these files.