can you tell where I must go ? because I am a begainer

Hello I have worked all you said to me deleted the old files and worked to download the file that you sent me by email, and appeared to me the black screen but I have a problem that the device is unable to recognize the vulnerability and show me a message in red and then work reboot and nothing happens, what work? I feel that I have a little left and correct the imbalance but I need your help little to know the solution What is the next step that I have to do?