chromebook recovery utility not unzipinng file

If the Chromebook Recovery Utility extension is not unzipping the file, there may be a problem with the file or with the extension itself. Here are some things you can try to fix the issue:

1. Check the file: Make sure that the file you are trying to unzip is a valid zip file and that it is not corrupted or damaged in any way. If the file is corrupted, the Chromebook Recovery Utility may not be able to unzip it.
2. Restart your device: Sometimes, a simple restart can fix minor issues with the Chromebook Recovery Utility extension. Try restarting your device and see if that fixes the problem.
3. Update the extension: The Chromebook Recovery Utility may not be able to unzip the file if you are using an outdated version of the extension. Try updating the extension to the latest version and see if that fixes the issue.
4. Use a different unzip utility: If the Chromebook Recovery Utility is still not able to unzip the file, you can try using a different unzip utility, such as the built-in Files app on your Chromebook. To use the Files app, simply double-click on the zip file and it will automatically be unzipped.

not connected Chromebook use card please help me my dear sir

you should change the zip format to .bin