In this post, you’ll learn more about the Oracle ErrorORA-01251: Unknown File Header Version read for file number string with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-01251: Unknown File Header Version read for file number string
Reason for the Error ORA-01251: Unknown File Header Version read for file number string
Read of the file header returned a record but its version cannot be identified. Either the header has been corrupted, or the file is not a valid database file.
How to fix the Error ORA-01251: Unknown File Header Version read for file number string ?
You can fix this error in Oracle by following the below steps
Have the operating system make the correct file available to the database, or recover the file.