According to Android_Guick_Start_Guide.pdf, I download the files(Board Images for NAND boot below) to SABRE-AI Board with MfgTool(2.2.3), but in the progress of downloading, something wrong suddently occurs! those images are from android_jb4.2.2_1.1.0-ga_image_6qsabreauto, I do not kown the reason for this. please help me ! Thanks a lot!