Out of space

Hi, I am very new at this. I was copying a project from Robotics Cape and 1/2 way through was told “out of space”? I would like to erase the currently loaded program and start afresh. How do I erase the program and all files off the eMMC? I am using Python3 on Putty and connected via the serial port/usb. I have searched the net but can only find info for the Beagleboard Black. I am using Blue.

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