Nintendo released another 3DS firmware update, which updates the 3DS system software to version 6.1.0.x. I can confirm that this update didn't block the R4i3DS (r4ids.cn) with the latest patch from 6.0.0.x. Not 100% sure if there are any newly blocked carts since 6.0.0.x , but it's unlikely since it's a really tiny update. I will updated with this update's changelog once it's out.
Update : DSTwo cart is confirmed working fine with the update
Changelog : Version 6.1.0-11U available via wireless Internet connection includes the following improvements:
Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.