Heck. I found a couple old R4 cards. ... Ones really really old, the other is newer and is meant to work on 3dses but... I think it's defunct because the site (apparently a newer site) doesn't seem to list this R4 card any more... So it might basically be dead, and it doesn't work on my dslite now either.

@Nine what happens? does it get stuck on "loading"? might need kernel files in the microsd, they won't boot without those

mine once had to had its firmware reflashed to keep working on a 3ds, and that could only be done through a regular ds

@squirrel Yeah, tried out the other firmware and it works fine on my dslite but I guess it's blocked by the New 3ds XL's new firmware. welp. ^^;

@Nine oh, so it's not bricked on regular DSes? you should be able to make it work.. my 3ds is (i think) up to date (though it is rooted) and my flashcart still works with it (still worked before the root)

it did the "an error occurred" after a 3ds update but a firmware update on the flashcart worked

the firmware update isn't just replacing the kernel files, it's running an .nds app on a ds where it can run, to actively flash the firmware inside the cart (not the microsd)

@squirrel Yeah, I'm not entirely sure how to get that working on this one, it doesn't seem to have that option for whatever reason.

Theres an Upgrade button but...it does nothing once I tap it.

@Nine can you get any info on which r4 model it is? what does the sticker say?

@squirrel It's an R4i-3ds . It's not got the v1.4.5 or RTS sticker on it, and the web address points to http://r4i-sdhc.com rather than a more recent site. (ironically the firmware on that site doesn't work, but the one on the more recent site does?)

@Nine I think your flashcart is way newer than mine... so following the instructions in that website don't do anything?

Urrghhh I wish I could be there to be of more hands-on help