You don’t want to work from a USB or external device.
The USB is great for moving a Backup (.qbb) file from one computer to another. You Copy that onto the computer so that it is Local = on the harddrive.
You use the Restore function in QB, not the Open button. […]
Resolution for 'computer to another issue: 'company files on thumb will not open, error codes -6000 & -304?' available: Yes.
The computer to another issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the computer to another issue yourself by looking for a resolution described in the article. If it is a complex computer to another issue or you are unable to solve the issue, you may contact us by clicking here or by using other computer to another support options.
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