R4 Revolution: The Flashcart Nintendo Hated (and some DS Homebrew)

Trying to resurrect my old R4 before I buy a new flashcart. Seems like it isn't being detected by the DS at all, any advice on if I can even fix it?

Flash Cartridges

Flash Cartridges

Is this R4 card going to kaboom? - The Independent Video Game Community

Nintendo DS R4 Card - Unboxing

I found an old r4 card and these are on it if I launch any of these could they harm the dsi or brick it (I don't know where the files came

Getting Started With DS Flash Carts - The Independent Video Game Community

FIXED R4 disk err code= 82 Please subscribe if it worked

HELP PLEASE!! I NEED R4i SDHC Firmware :(( - The Independent Video Game Community

ZXDS via SD Card on DSi (via TWL++ or Similar)? - The Independent Video Game Community