Nintendo 3DS R4 card reusable?

I have an r4 card, but it no longer works because I bought a new game and I believe that the r4 card is now blocked. Can you do something there?

The best way I can think of to install blocked flash cards would be to install the Luma Custom Firmware.

I already described how this works in your last question:

Whether it will help you if your card slot is partly broken is of course questionable.

With the no longer developed homebrew "TWLoader" there's a software solution for at least some DS games:

https://wiidatabase.de/twloader-v6-7-0/