How to send file over serial port in Windows Command Prompt
This works for me to send a binary file to an Arduino :
mode COM21 BAUD=115200 PARITY=n DATA=8copy yourfile.txt \\.\COM21Notice the \\.\ which is mandatory for port numbers >= 10, and can be used too for port numbers 1-9.
You need to specify /B for binary file after the .zip file (or whatever else it is) as well as at the end of the command line. e.g. COPY ABinary.File /B COM1 /B otherwise it will stop at the first non-text ASCII character.
Try using Hyperterminal at the receiving end and Transfer > Capture Text