IMU Firmware Update problem

There was a problem during IMU Firmware Update.
Nothing can be done because of the problem.
How do I solve this?

The IMU Firmware version says -1.

When you run the update again, only a warning message appears.
The contents of the warning window are as follows.

:Unable to detect device to update. Drivers are probably missing.
Make sure your PC is connected to Internet for automatic driver update.

This problem occurred after installing sdk 3.5, so it is the same problem even if it is updated after reinstalling 3.4 again. It’s serious.

I disconnected the Windows device after disconnecting it myself. In Explorer, the firmware version looks fine, but it does not update to the higher version, and the same phenomenon occurs.