For App 3.0 Board; Figure 11 : Boot Mode Detected; Figure 12 : Firmware Upgrade Completion - Bosch BME280 User Manual

Bosch Sensortec | BME280 User Manual
 Select the default firmware update file (*.fwu2) from the DD2.1 UI installation directory in the folder Firmware.
 Click Flash.
 Once firmware upgrade is complete, restart the application board, and DD2.1 UI.

3.2.2 For App 3.0 Board:

To upgrade the firmware of DD2.1 UI to match the current version, follow the steps below:
1. Click Menu -> Settings-> Firmware Upgrade. The following window appears:
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Figure 11 : Boot mode Detected

Figure 12 : Firmware upgrade completion

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Document number: BST-BME280-DSxxx-yy