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The kfed is an undocumented utility located at $ORACLE_HOME/bin that can be used to support ASM deployments.
The kfed does not depend on the mount state of an ASM instance or ASM disk group, so it can be used with ASM instance down and on a disk group that does not mount.
KFED can also be used on ASM disks with corrupt ASM metadata.
unable to open file '<file_path_and_name>' corresponds to ORA-15031
ASM Library Specification
AU number to examine or update
Allocation Unit size in bytes
Block number to examine or update
Metadata block size in bytes
Update checksum before each write
CH/KSUM=<YES | NO>
Count of AUs to process
ASM device to examine or update
Don't suppress releated lines when dumping corrupt blocks