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Cannot enter bootloader or update the firmware

Enable Bootloader mode

Open the RuuviTag enclosure, locate buttons B and R: keep button B pressed down and press the reset button R. Red indicator LED light will light up and stay on. This means that the RuuviTag is currently in Bootloader mode and ready for firmware update.

Firmware package

Check that the firmware package you are trying to update to your Ruuvi sensor is correct and not corrupted. Download latest officially supported packages from https://lab.ruuvi.com/dfu.