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today i'm fix wrong Boot Checksum (11 sector) by filling this sector of repeating values of needed checksum. after this when i run fsck.exfat or mount disk on ubuntu i get one same message:
Unknown entry type 0xa0

But on mac os x i have success mounting this disk. And data (files and directories ...

thanks for advice, but
~$ sudo fsck.exfat /dev/sdb3
exfatfsck 1.0.1
ERROR: invalid VBR checksum 0x180000 (expected 0xb2efab44).

also i tried run os x fsck_exfat utility:
~$ sudo fsck_exfat -d /dev/rdisk3s3
Password:
Opening /dev/rdisk3s3
** Checking volume.
** Checking main boot region.
fsck ...

i'm already tried this solution (by rewriting "53 EF" on "00 00"), now winhex showing partition as exFat, but any os still can't recognize filesystem of partition.

Hello.
After running fsck.ext4 [/ b] on my exFat disk i lost exFat partition and my partition began mounting as ext4 disk. After this i'm found exFat partition via testdisk utility and wrote new one, also i'm rebuild BS and MBR. Now i can explore files on exFat disk throw testdisk and partition ...