The 3DS newest firmware v4.5.0-10 blocked many flashcarts. After dstwo released an update patch, r4i gold 3ds said the pcb number “C” and icon “ Deep Labyrinth” can work on 3DS v4.5.0-10 directly without any updating.
We are expecting another card which can break it, and now r4i sdhc 3ds become the third one. But bad news is the update patch has not released yet, just the new cards which is manufatured recently can work on 3DS v4.5.0-10 directly. Good news is, all the r4i sdhc 3ds in G4D is the new cards and work on 3DS v4.5.0-10 perfectly!
But for old card, we have to wait.. hope the patch will released soon!