how to FLASH upgrade FW in the nRF51822 though my application controller?

[Wim]

want to FLASH upgrade FW in the nRF51822 though my application controller. Is C or C++ code available for this operation or can you deliver a protocol description how to setup this ?

[Ole Morten]

If they explicitly need to be able to replace the softdevice, this can not be done over UART, and will have to be done over the Serial Wire Debug interface. This interface is defined by ARM, so you should refer to their documentation on it. Chapter 10 in the nRF51 Reference Manual gives a description of how to enable this interface.