PyOCD

Erase internal Flash Memory

To erase the whole flash range use pyocd erase with the option --mass:

pyocd erase --mass

To erase flash sectors pyocd erase with the option --sector:

pyocd erase --sector 0x080c0000-0x08100000

pyOCD Docs

https://github.com/pyocd/pyOCD/tree/master/docs