Interrupting the power while updating the firmware can permanently kill the chip. Reading the Results
Identifies and maps out bad blocks on the NAND memory, which can recover drives reporting "no media" or "write protection". smi mptool sm32x sm34x smi mass production tool
USBDev.ru (SMI Section) : The most comprehensive archive for SM32x and SM34x tools. Interrupting the power while updating the firmware can
Enables the creation of multiple partitions, including a "CD-ROM" partition for bootable ISO images. smi mptool sm32x sm34x smi mass production tool
SM3255, SM3257 (AA/ENAA/ENBA), SM3267 (AB/AE), SM3268, SM3269, SM3271, and SM3281. SM34x Series: SM340AB and similar legacy controllers. How to Use SMI MPTool for USB Repair