Agreed... read and search... read and search...also be aware there are 2 variants in this forum..... i337 which you have and the i337m which is Canadian / Mexico.... the roms are not interchangeable.. Be certain that the rom you are going to install is for your phone... if you don't see any posts from people with i337 it is probably best to stay away... most dev's will stipulate which phone the rom is for... if you don't know.. search the rom thread your interested in for i337..... you will see any posts that contain your model..... I can't emphasize enough how important that it is to read carefully.....