I can't downgrade anymore? I bought this 3DS pre-owned and I'm not sure if it was below 4.5 anyway, but I upgraded it to play online. I assumed a flash cart would work regardless. Stupid mistake I guess or am I reading things wrong? Is the issue like the PSP days where you could only run the exploit on certain PSP models or is it really just a firmware issue? How much would a "cartable" 3DS cost?