Hello, im a new to this kind of things. Yesterday I flashed a rom and when I booted the rom up a yellow window poped up, check the attactment how the window looks like. I have tried many solutions on the internet but none of them has worked. My efs folder is also empty, and I didn't make a backup of it i just made a full backup in cwm. I'm hoping that somebody can help me because my S4 is the only phone that I have. Sorry for my bad english.