Hello! I have thos exact issue as documented in the following post:
I followed all the troubleshooting as descrived in this post and camera is still not working.
In summary the D455 camera became undetectable after a firmware update and could not be found by the Windows Device Manager or a range of different RealSense applications, such as the RealSense Viewer, Dynamic Calibrator and rs-fw-update. The RGB stream could not be accessed outside of the SDK in the Camera app of Windows. The Windows hardware troubleshoot tool was also unable to resolve the problem.
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