The DFU process is done using the nRF Connect mobile app.
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Start DFU mode This can be done by entering 0x99 as a configuration variable in either the remote control or wireless controller firmware using bluetooth control. You can also initiate DFU mode by holding the board button down for several seconds during a reset. (ie: when power cycling, or pressing the reset button on the board)
Verify the bootloader starts advertising as "TSDZ2_DFU".You’ll need to make sure the package you created in step #7 is accessible on the mobile phone you’re using. Now, connect to the DFU target:
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Copy the DFU .zip file for the wireless remote to the phone or to the folder on PC of your choice This can be done by simply emailing the update file to your device.
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Use nRFConnect app to connect and do an OTA DFU using the .zip file you copied To start the process, press the DFU button. Then click “Open Document Picker”Choose the .zip file
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Click the “Start” button The DFU will begin
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the DFU process is now complete Once the DFU process has completed, you should see that your new application (that was part of the DFU package) is now running.
Here is a video showing a wireless DFU for the TZDZ2 remote control:
