The Top3100 has onboard firmware (not just PC software). Mismatched firmware vs. PC software is the #1 cause of “Device not ready” errors.
Ensure the USB cable is connected directly to the computer, not a USB hub.
For its price point, it’s incredibly versatile—but it to function. There is no open-source alternative like flashrom for this hardware.
Over several thousand devices from major manufacturers like Intel, Atmel, Microchip, SST, ST, and Winbond.