then I online upgrade it to 4.2, after restart I got Error:003
I bought a GC controller, press 4 buttons at same time did not work, I took a part of the GC and then savemiifrii works, screen showed black with right bottom corner as "4.2 USA".
After going to this recovery mode, I rented a retail SSBB NTSC-U game, but it did not autoboot at all. then I read forums, looks like even you install drivekey it wont work for this case either.
Now I am waiting other solution, at least let me see something else on the screen other than "Error:003"