does the easy have a button?
It does and functions similarly to the RDV4
I’m not too familiar with using the PM3 on Windows using Proxspace. I have (and do) use PM3 on Windows using WSL and/or Linux OS.
Could be a privilege mismatch? Make sure the terminal you are running is with admin privileges.
Ensure you have the correct drivers installed for the COM port of the PM3. Also need to ensure that the drivers are correct for when the PM3 button is pressed on startup.
Since you have a PM3 Easy you should also be specifying when flashing that it’s not the expected RDV4.