Although kfed can be used to write a modified header back into the disk header, you should be very careful to use this tool (under the Oracle Support’s supervision).
+ASM2 > ls -ltr /dev/oracleasm/disks*
total 0
brw-rw---- 1 oracle dba 120, 17 Feb 14 12:37 OCR_VOTE_DISK01
brw-rw---- 1 oracle dba 120, 33 Feb 14 12:37 OCR_VOTE_DISK02
…
…
brw-rw---- 1 oracle dba 120, 241 Feb 14 12:37 ORADATA_DD501_DISK10
brw-rw---- 1 oracle dba 120, 257 Feb 14 12:37 ORADATA_DD501_DISK11
brw-rw---- 1 oracle dba 120, 273 Feb 14 12:37 ORADATA_DD501_DISK12
brw-rw---- 1 oracle dba 120, 289 Feb 14 12:37 ORADATA_DD501_DISK17
+ASM2 > kfed read /dev/oracleasm/disks/ORADATA_DD501_DISK10
kfbh.endian: 1 ; 0x000: 0x01
kfbh.hard: 130 ; 0x001: 0x82
kfbh.type: 1 ; 0x002: KFBTYP_DISKHEAD
kfbh.datfmt: 1 ; 0x003: 0x01
kfbh.block.blk: 0 ; 0x004: T=0 NUMB=0x0
kfbh.block.obj: 2147483653 ; 0x008: TYPE=0x8 NUMB=0x5
kfbh.check: 3567150782 ; 0x00c: 0xd49e66be
kfbh.fcn.base: 0 ; 0x010: 0x00000000
kfbh.fcn.wrap: 0 ; 0x014: 0x00000000
kfbh.spare1: 0 ; 0x018: 0x00000000
kfbh.spare2: 0 ; 0x01c: 0x00000000
kfdhdb.driver.provstr:ORCLDISKORADATA_DD501_DISK10 ; 0x000: length=28 =>The ASMLib provider string
kfdhdb.driver.reserved[0]: 1145131599 ; 0x008: 0x4441524f
kfdhdb.driver.reserved[1]: 1598116929 ; 0x00c: 0x5f415441
kfdhdb.driver.reserved[2]: 808797252 ; 0x010: 0x30354444
kfdhdb.driver.reserved[3]: 1229217585 ; 0x014: 0x49445f31
kfdhdb.driver.reserved[4]: 808536915 ; 0x018: 0x30314b53
kfdhdb.driver.reserved[5]: 0 ; 0x01c: 0x00000000
kfdhdb.compat: 186646528 ; 0x020: 0x0b200000
kfdhdb.dsknum: 5 ; 0x024: 0x0005
kfdhdb.grptyp: 1 ; 0x026: KFDGTP_EXTERNAL => External redundancy diskgroup
kfdhdb.hdrsts: 3 ; 0x027: KFDHDR_MEMBER=> Member of a diskgroup
kfdhdb.dskname: ORADATA_DD501_DISK10 ; 0x028: length=20 =>The ASM disk name
kfdhdb.grpname: DG_TRX_DD501 ; 0x048: length=12 =>The group name
kfdhdb.fgname: ORADATA_DD501_DISK10 ; 0x068: length=20
kfdhdb.capname: ; 0x088: length=0
kfdhdb.crestmp.hi: 32939703 ; 0x0a8: HOUR=0x17 DAYS=0x15 MNTH=0x7 YEAR=0x7da => creation timestamp
kfdhdb.crestmp.lo: 3277276160 ; 0x0ac: USEC=0x0 MSEC=0x1d1 SECS=0x35 MINS=0x30
kfdhdb.mntstmp.hi: 32950963 ; 0x0b0: HOUR=0x13 DAYS=0x15 MNTH=0x2 YEAR=0x7dbèTimestamp when the disk was mounted
kfdhdb.mntstmp.lo: 1680539648 ; 0x0b4: USEC=0x0 MSEC=0x2c0 SECS=0x2 MINS=0x19
kfdhdb.secsize: 512 ; 0x0b8: 0x0200=>512 byte sector size
kfdhdb.blksize: 4096 ; 0x0ba: 0x1000=> Block size
kfdhdb.ausize: 1048576 ; 0x0bc: 0x00100000=> 1M allocation units
kfdhdb.mfact: 113792 ; 0x0c0: 0x0001bc80
kfdhdb.dsksize: 131069 ; 0x0c4: 0x0001fffd =>Disk size (OS)
kfdhdb.pmcnt: 3 ; 0x0c8: 0x00000003
kfdhdb.fstlocn: 1 ; 0x0cc: 0x00000001
kfdhdb.altlocn: 2 ; 0x0d0: 0x00000002
kfdhdb.f1b1locn: 0 ; 0x0d4: 0x00000000
kfdhdb.redomirrors[0]: 0 ; 0x0d8: 0x0000
kfdhdb.redomirrors[1]: 0 ; 0x0da: 0x0000
kfdhdb.redomirrors[2]: 0 ; 0x0dc: 0x0000
kfdhdb.redomirrors[3]: 0 ; 0x0de: 0x0000
kfdhdb.dbcompat: 168820736 ; 0x0e0: 0x0a100000 => Compatible.RDBMS
kfdhdb.grpstmp.hi: 32939703 ; 0x0e4: HOUR=0x17 DAYS=0x15 MNTH=0x7 YEAR=0x7da
kfdhdb.grpstmp.lo: 2505329664 ; 0x0e8: USEC=0x0 MSEC=0x113 SECS=0x15 MINS=0x25
kfdhdb.vfstart: 0 ; 0x0ec: 0x00000000
kfdhdb.vfend: 0 ; 0x0f0: 0x00000000
kfdhdb.spfile: 0 ; 0x0f4: 0x00000000
kfdhdb.spfflg: 0 ; 0x0f8: 0x00000000
kfdhdb.ub4spare[0]: 0 ; 0x0fc: 0x00000000
kfdhdb.ub4spare[1]: 0 ; 0x100: 0x00000000
kfdhdb.ub4spare[2]: 0 ; 0x104: 0x00000000
kfdhdb.ub4spare[3]: 0 ; 0x108: 0x00000000
kfdhdb.ub4spare[4]: 0 ; 0x10c: 0x00000000
kfdhdb.ub4spare[5]: 0 ; 0x110: 0x00000000
kfdhdb.ub4spare[6]: 0 ; 0x114: 0x00000000
kfdhdb.ub4spare[7]: 0 ; 0x118: 0x00000000
kfdhdb.ub4spare[8]: 0 ; 0x11c: 0x00000000
kfdhdb.ub4spare[9]: 0 ; 0x120: 0x00000000
kfdhdb.ub4spare[10]: 0 ; 0x124: 0x00000000
kfdhdb.ub4spare[53]: 0 ; 0x1d0: 0x00000000
kfdhdb.acdb.aba.seq: 0 ; 0x1d4: 0x00000000
kfdhdb.acdb.aba.blk: 0 ; 0x1d8: 0x00000000
kfdhdb.acdb.ents: 0 ; 0x1dc: 0x0000
kfdhdb.acdb.ub2spare: 0 ; 0x1de: 0x0000
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