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The best way I have found of investigating these types of issues, is to do the following:
- Pick one of the failed devices
- Run the same uninstall command manually from run or from a command window
- Review the completion of the task / notice any verbose error messages etc
- If the error is a false positive, meaning it actually worked then you can customise the return string within the package you created to return success instead of failure
Unless the msi has been built properly & fully ice tested, it is possible to return strange codes like this even if they are successful.