I acquired from two separate sources a DSiXL 25th Anniversary Edition and three R4i Ultra cards for free. The DSiXL has firmware 1.4.5E, which won't load the stock R4i Ultras. A friend lent me a standard DS Phat which does load them. I'm trying to use the Phat to upgrade the R4is to a firmware that'll let them work in my DSiXL, but so far I'm failing. I've tried two firmware upgrades from here, then I tried others under the assumption that ruining one of the cards wouldn't be much of a loss since I have the others, but while the cards keep on loading in the Phat, showing various different names/icons for the cart as I try various upgrades and actually loading .nds games, all they ever cause in the DSiXL is a "An error occurred" message and the only thing I can do is reboot the system. Is there a way out of this situation that doesn't involve buying another flashcart? I'm aware the Ultra isn't the best cart on the market and has been out of production for a while, but I'd be perfectly happy with it if I could only get it to run. I imagine all I'd need is a firmware compatible with the 1.4.5E firmware on the DSiXL, then I could tinker with kernels and cart software at leisure, but I can't seem to find any such firmware upgrader. The site stamped on the carts (r4ultra.com) is no longer active and I can't find direct mirrors.