The tool is distributed in ZIP/RAR archives on obscure forums (USBDev, MyDigitalLife). Antivirus software will flag it as a hacktool (which it technically is). You must disable Windows Defender, run as Administrator, and often use an older Windows 7/10 machine.
Scanning the NAND flash for bad blocks and marking them so the controller skips them, which can "shrink" a drive back to a stable, working capacity. Information Modification: smi mptool sm32x sm34x smi mass production tool full