Your phone, too, doesn't have an internal sdcard, sorry that's hardware stuff
I tried the ones you have posted for the GS3 and I keep getting boot loops. I even tried the app you found on the link you posted, and it doesn't seem to work.
I'm running AT&T's Galaxy S III (I747/D2ATT) with CyanogenMod 10.0 (JB 4.1.2). I attempted to mod it myself, and I still got boot loops. Hopefully you can clarify this for me.
he is i think busy for his exam until 19 Jan. just wait patiently for his help.
thank u