Do disconnect the cable or turn off the power until the process is 100% finished, as this can "brick" the device. Troubleshooting Common Issues

USB-to-Serial adapters are notoriously unreliable with this legacy software; a native DB9 serial port on an older PC is highly recommended for stability.

💡 If you are struggling with modern Windows, some users find that using a 32-bit version of Windows 7 is a more stable middle ground than emulating DOS on Windows 10. To give you the best help, let me know: What operating system are you using (Windows 10, 11, etc.)?

Reliable "extra quality" programming starts with the right hardware interface to ensure data isn't corrupted during the write process: Programming the Motorola GM950 on Windows 10

The software opened not with a splash screen, but with a command-line prompt in a tiny green-on-black window: