How do I recover field data of SharePoint list as it disappeared & not present in version history.

Below scenario

1)I have tried to change the choice column type from the dropdown to checkboxes.
2)The choice field gets changed from dropdown to checkbox, but the data of that field get disappears. I have tried to find that data with version history, but that field data is also not present in version history too.

Can I get help with this?
How do I recover of field data of the SharePoint list.