Download
Download SDK: Software Development Kit (*1), Firmware (*2) and Writing Tool (*3) before the firmware writing.
Refer Chapter 4 in "Multi Sensor Board Beacon Firmware, CLI User Guide" for details.
Multi Sensor Board Beacon Firmware CLI User Guide
Multi_sensor_board_CLI_Guide_v1_1_EN-3822580000387112.pdf
(1) Download of Nordic SDK - Preparation of SoftDevice
Prepare SoftDevice which is packaged in Nordic SDK.
* SDK Folder which includes SoftDevice: SDK/components/softdevice/sXXX/hex
Please see following table for the version number of sXXX.
You need to download Nordic SDK of appropriate version for the application you use. Please download it from following URL.
https://www.nordicsemi.com/Software-and-tools/Software/nRF5-SDK/Download#infotabs

(2) Preparation of Sample beacon firmware
https://www.kagafei.com/jp/eng/products/wireless-modules/bluetooth/ey1sensor-kit-cli.html
Download the proper HEX file from Sample beacon firmware.
* HEX file is "XXXXXXX_EVB_CLI_beacon.hex" .
(3) Install of Writing Tool
Download and install nRF Command Line Tools from following URL to write firmware into module evaluation board.
https://www.nordicsemi.com/Products/Development-tools/nrf%20command-line-tools/download#infotab
Firmware Writing
Evaluation board
, evaluation kit
Connect evaluation board to PC and write firmware into evaluation board using commands.
(Before the writing, you need to store the SoftDevice and the HEX file, which was downloaded in the step above, in any directory.)

Plsase watch a short video to learn the procedure of writing firmware into evaluation board using command window.
Sensor Selection/Communication
Configure sensors by sending commands to evaluation board from PC.
If the writing is completed correctly, the evaluation board returns "OK" against the commands.
Sensing Evaluate Solution uses UART infterface for the communication of commands and responses.

Refer Chapter 5 and later in "Multi Sensor Board Beacon Firmware, CLI User Guide" for details of commands that supported by each sensor.
Multi Sensor Board Beacon Firmware CLI User Guide
Multi_sensor_board_CLI_Guide_v1_1_EN-3822580000387112.pdf
Plsase watch a short video to learn the procedure of configurating the sensors using command window.
Bluetooth® low energy evaluation board or evaluation kit can be purchased
through various online distributors.