A: Your NAND flash has physical defects. Set "Bad Block Ratio" to 10% in MPTool settings. If it fails again, the memory bar is e-waste.
A: No. Driver updaters will install the wrong SMI driver (e.g., SM3268), which makes Error 43 permanent until you re-run MPTool. Sm3255aa Memory Bar Driver 43
Before fixing the error, you must understand the hardware. The SM3255AA is a USB 2.0 NAND flash controller chip manufactured by Silicon Motion, Inc. (SMI) . It is a low-cost, high-compatibility microcontroller found in millions of generic USB flash drives, branded memory bars, and budget SSDs. A: Your NAND flash has physical defects
When we say "Memory Bar," we are referring to a standard USB flash drive or thumb drive. The "SM3255AA" is the brain of the operation. It handles: A: No
A: Microsoft changed USB power management in Windows 10/11. The SM3255AA's firmware is from 2012. You need to disable USB selective suspend in Power Options → Advanced → USB settings → Disable.