How to program nrf52840 without segger jlink?

[Rajat]

Hi

I am using nrf52840 on a custom board with segger embedded studio as development IDE.
I would like to flash the hex file generated without using segger embedded studio via command line or some tool using some generic SWD programmer(Like Bumpy or ST Link)

Is there a way to flash the hex file on the board without using the nrf52840 PDK ? 
Can we flash the hex file to board using any generic SWD proogrammer?

Thanks

[Toyman]

try opengdb