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Verify that you are in single-user mode.
The one you're going through is the most effective solution to date. It is critical to determine whether the file is being accessed in single-user or multi-user mode.


Windows should be closed by all users accessing the file.
Restart your computer. Locate the file you attempted to open and press 'Control' + 'C' to make a copy on your PC.
Navigate to its default storage path, then press the keys ‘Control' + ‘V' to paste the file.
Make an attempt to access QuickBooks Desktop.
If the above solution does not work, try QuickBooks File Doctor.
To know more: https://takeactionnyc.com/quickbooks-error-code-6123/