I was trying to run Arducam mini 2MP with Arduino Uno on the serial monitor, everything seems ok but on the host v2 it shows COM open fail.
Can you share your code so we can review it? Only then can we probably solve the problem.
I found this, but since I don't have the code I can't judge if this helps:
According to some websites, you might not have properly configured the SPI interface. You need to modify the memorysaver.h file to enable the OV2640_MINI_2MP camera module. Also, you need to make sure you are using the correct pins for SPI communication.
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