FAQ: RED LED of death

There have been cases where after updating the firmware the ruuvi returns to the DFU (Device Firmware Upgrade) and does not enter the actual application.

The ruuvi development board along with the Nordic development kit and nrjprog can be used to recover the device.

nrfjprog --family nrf52 --eraseall

nrfjprog --family nrf52 --program ./builds/hex/sdk12/ruuvitag_b3_debug_bootloader.hex

nrfjprog --program ./nRF5_SDK_12.3.0_d7731ad/components/softdevice/s132/hex/s132_nrf52_3.0.0_softdevice.hex

nrfjprog --family nrf52 \
                --sectoranduicrerase \ 
                --program  ruuvi_examples/ruuvi_firmware/ruuvitag_b/s132/armgcc/_build/ruuvi_firmware.hex \
                --reset