The tool may be set to a "High Speed" USB mode that the hardware cannot sustain.

Among the most frustrating of these is . Unlike common errors like 4032 or 5054, Error 1042 is less documented but equally debilitating. If you are staring at a red progress bar followed by the message STATUS_EXT_RAM_EXCEPTION or simply "Error 1042," your device is refusing to cooperate.

If your device’s preloader is damaged, Error 1042 will appear every time. However, this is a catch-22: you need to flash a new preloader, but you can’t flash because of Error 1042.

Windows driver issues cause more SP Flash errors than any other variable.