These are general approaches to take if you are experiencing problems with the board recognition in the Web Editor.
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After installation, take into account that it will take some time for the drivers to get installed. This is an automatic process done by the Arduino Create Agent.
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Make sure you are using the Web Editor in the same browser the Create Agent was installed.
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Try to avoid USB 3.0, since it has been found that it can cause some issues.
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Try to reinstall the Arduino Create Agent and make sure that you give required permissions (sometimes browsers automatically deny hidden pop-ups).
But it was working just a while ago
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Try to reset the board by pressing the reset button on it while it is connected to the computer.
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Try to clear the cache in your browser.
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Check if the USB cable you are using is working and it is correctly connected to the computer.