>set until scn 1812690
>ORA-01152: file 2 was not restored from a sufficiently old backup
You need to have database datafile backups created before the target SCN.
Hemant K Chitale
According to this error your controlfile is old and you are restoring your datafiles from backup. If still you want to open the database in resetlogs, then what you can do is backup your controlfile as trace using "alter database backup controlfile to trace as "LOCATION";. Then recreate your controlfile from trace. But before take backup of controlfile and then re-create it using create controlfile script from the trace you have generated. Then try open in resetlogs. It will open.