SP Flash Tool is incredibly powerful, but it’s also incredibly literal. It will happily overwrite anything you tell it to—even if you told it nothing. The “please select one rom at least” error is your last chance to avoid disaster.
Frustrated, he said, “The tool is broken.”
This error occurs within the SP Flash Tool (SmartPhone Flash Tool) interface when you attempt to click the "Download" button without properly loading the necessary firmware files (scatter file) or without checking any specific partitions to flash. Essentially, the tool is empty and doesn't know what to write to the device.