QPYcom firmware download

I am attempting to upload QuecPython firmware on a EC200U module that is on a custom board rather than an EVB. I can connect to the serial port comfortably. However I get this error on windows: Cannot load BMAFrame DLL.
What could I be doing wrong?

HI, Gideon
Please try again with the latest QPYCOM

Hi Felix.
I am actually using the latest version 3.5.

hi, Gideon
The following is my operation procedure, in my test, it worked well, please refer to it