The config folder inside the SP Flash Tool directory contains critical chipset definitions. If these get corrupted (e.g., by an antivirus or an incomplete update), the tool will reject your platform.
This is the most frequent cause. Trying to flash a device with a Dimensity 700 or Helio G99 using SP Flash Tool v5.x (designed for MT6572/MT6580 era) will trigger the error immediately. sp flash tool not support platform
The simplest fix. MediaTek updates the Download Agent regularly. The config folder inside the SP Flash Tool