Ah, so I calmly think back about what I did, and I remember when I was in Document folder, I delete some files (before that, I installed Collection Manager, but I don't use it so I want to delete it ). So maybe I accidentally delete the Kual file.
I check in the trash, i see the Kual file, I restore that file, now Kual menu show up again,
everything back to normal.
So the device still being jailbreaked, Kual menu didn't show up because I accidentally delete it.
Thank you very much
