If the red "power" LED is flashing while the software shows "Not Connected," the hardware is receiving power but cannot communicate with the PC.
Some USB 3.0 ports (often blue) on modern laptops may not provide the correct voltage for older programmer designs. Try switching to a USB 2.0 port if available. iprog programmer not connected new
Replace the MC3406 current sense resistors with 0.22 Ohm to fix 10V and 12V power errors. 4. Software Compatibility If the red "power" LED is flashing while