Got one step further..I guess we need to use the J-Flash lite utility of Segger. In my case, I selected device nRF52832_xxAA, SWD and speed 2000 khz.
From Espruino site I would like to load espruino_2v02_RAK8211.hex but cannot download the file :-(. According to website, the hex file can be loaded from GitHub as well...tried but could not find it.
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