: Users often report the "Test" button showing "OK" in green, but the actual "Update" failing with red error text. Troubleshooting & Solutions
Disconnect from the internet if using older "clone" software versions, as they may attempt to validate the license and block the device. delphi ds100e firmware update problem link
Try a different USB port on your laptop, preferably a USB 2.0 port if you are using an older device. : Users often report the "Test" button showing
: This is frequently caused by incorrect driver installation or the software being unable to communicate with the hardware. delphi ds100e firmware update problem link