Why is it not possible to use Pyocd and Picoprobe for flashing nRF51822?

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It is not possible to use Pyocd and Picoprobe for flashing nRF51822 because the nRF51822 chip does not support either of these tools. The nRF51822 uses a proprietary protocol for programming and debugging called SWD (Serial Wire Debug), which requires a specific programming interface such as J-Link or nRFgo Studio. The Picoprobe, on the other hand, is a tool specifically designed for use with Raspberry Pi and does not support the SWD protocol required for programming the nRF51822. Similarly, Pyocd is a Python-based debugger and flash programmer that does not support the SWD protocol required for programming the nRF51822.