Avoid "universal" USB formatting tools. You need the specific SMI MPTool executable.
If you try to flash a 2015-era SM3257EN drive using a 2023 version of MPTool, the software may lack the legacy database definitions required to recognize your older NAND chip. smi mptool sm32x sm34x smi mass production tool best
(Mass Production Tool) is a proprietary software used by manufacturers to configure, format, and test USB flash drives that utilize SMI (Silicon Motion) controllers. Specifically, the SM32x and SM34x series are popular USB 3.0 controllers found in many modern flash drives (brands like Kingston, Silicon Power, ADATA, and generic drives). Avoid "universal" USB formatting tools
The SMI MPTool SM32X SM34X offers a range of features that make it an indispensable tool for manufacturers and developers working with SMI devices. Some of its key features include: (Mass Production Tool) is a proprietary software used
Set to Capacity for dead drives, or Speed if you want to maximize read/write bandwidth.