The /root/sdcard path was located to the INTERNAL sdcard before the switch.
I think that the option was NOT checked BUT when it check it, it became "Use internal" which is incorrect.
Anyway, my phone wont reboot, not even when holding down VolUp+Power.
I will keep trying my just a warning to you all, don't do any hardware change with the Nightly builds (assuming that the sdcard is hardware)!
I'm using linux so I'm not sure that it's possible to use any software like the softwares on windows.
Instead of replacing the mainboard are there any other options? I bought my phone from craigslist so I don't have the warranty.