If you have raw NAND dumps or are reverse-engineering, "firmware verified" can be done manually:
Insert your corrupted USB drive into a direct motherboard port (avoid external USB hubs). Select your drive from the tool's list. firstchip fc1178bc firmware verified
There is no official repository maintained by FirstChip (the SDK is closed-source and only given to mass production houses). However, the data recovery community has curated several reliable sources. If you have raw NAND dumps or are