Dear Neil,

We have identified the root cause of the issue.

The problem was caused by a faulty power supply. After replacing the power supply, the programmer started working normally and the EC: E1 error disappeared.

Thank you for your assistance and support.

Thanks,
Vitaly

Dear Neil,

I have attached the problem report for analysis.

As additional troubleshooting, I have already:

installed PG4UW v3.99 and then upgraded to the latest version
tested on both Windows 11 and Windows 10
tried different USB cables and USB ports
disabled USB power saving settings
tested the ...

Hello Neil,

I have exactly the same problem with my Dataman-40Pro on Windows 11.

The programmer is detected by USB and appears in Device Manager as:
“DATAMAN-40PRO, Universal 40-pindrive Programmer”

However, PG4UW cannot establish connection and always shows:
“Establishing connection failed (EC ...