Hi Richard and Rudolf,
Similar problem. I tried to update two Competition SRS’s V0.22 to latest version V0.28. Connection was USB to computer and other end to the TELE port left side. Power to the device was from two batteries ( Powerbox 4000 mah LIPO ) and Sensor switch, PC control selected. The first device stopped at 69% and wouldn’t continue further. The SRS was powered off and disconnected from the computer. Thereafter it would not power back on, just a black screen on the SRS. With everything reconnected the computer screen showed “No Powerbox Device connected “
The second device updated successfully. The Terminal programme was the latest Version 3.1.3
I’ll send it to DA in Australia but would welcome your thoughts on the problem with the first device.