The MPTool requires a specific "ISP" (In-System Programming) file that matches your specific NAND memory chip (e.g., Toshiba, Hynix, or Samsung).
Look for tools that mention SSS6698 or 3S . 3. How to Use the TC58NC6623 SSS6698BA MPTool tc58nc6623 sss6698ba mptool work
The status bar will cycle through erasing, bad block scanning, and ISP (In-System Programming) writing. The MPTool requires a specific "ISP" (In-System Programming)