Sql-server – Impact of Log backups restore process after file\file group restore on a database

The only way to restore a single file group is to run in all the logs so it's up to date with the rest of the files. This would of course run in the bad data modification you're trying to prevent but it's necessary to ensure consistency throughout the database. You'll need to restore it to another location and move the data over.

http://msdn.microsoft.com/en-us/library/ms178099%28v=SQL.105%29.aspx

You cannot restore a single filegroup to an earlier state, because that will leave the database in an inconsistent state.

You can restore a database one filegroup at a time. However, as long as a particular filegroup is not up to date with the PRIMARY filegroup, any access to a table that is stored (even in part) on that filegroup will cause the query to error out. Only after all filegroups are restored to the same level (meaning to the same "log sequence number") can the entire database be accessed.