Okay, so I've already messed up with two 3DSes, so I'm trying not to mess up a third.
I have an Old 3DS running 10.3.0-28U. The browser seems to be blocked on it, so I obtained a copy of Cubic Ninja and have successfully used Ninjhax to access the HBL. I have successfully installed Menuhax to autoboot into the HBL. However, anything I try to load from here seems to fail.
I've been following the guide at
https://gbatemp.net/threads/tutorial-installing-rxtools-custom-firmware-3ds-and-2ds.390867/ , as well as trying to follow the instructions from Gateway's manual, but nothing is working.
EmuNAND9 flashes the bottom screen red, then black, then red again, and then returns to the HBL. Pasta freezes. Gateway Launcher freezes. RxTools freezes. No error codes, no error messages, just red bottom screen, then black screens, and frozen.
I don't seem to be able to find any information on where to go from here, but with the sheer volume of posts, it's very difficult to keep up with everything. Can someone please point me in the right direction?