Hello,
If using an older MFGTool you may need to do some changes to uboot and/or kernel, you can refer to the MFGTool documentation Manufacturing Tool V2 Linux or Android Firmware Development Guide V2 for configurations needed and Manufacturing Tool V2 Quick Start Guide for examples on how to use this tool, they are located at:
<MFGTool path>\Document\V2
Hope this helps,
Best regards,
Aldo.