Cannot boot Windows partition after Yosemite update (Windows partition is encrypted with Bitlocker)

Question

Hello!I have a MBP Retina 2015 with a Mac partition and a Windows partition. Both partitions are encrypted using the tools provided by the OS (Bitlocker on Windows).Today I updated Yosemite to the latest version and that made my Windows partition unbootable. The partition is gone in OS X, but I still see it if I boot with ALT pressed and Bitlocker still runs fine. The problem is that after entering the Bitlocker password I get an error saying Windows cannot boot (I guess because it cannot find the OS partition).I&#x27;ve been reading all the other threads from people hitting a similar problem, but because I have a slightly different config than others (Windows encrypted by Bitlocker) I&#x27;m scared to ran the gpt commands and lose everything.Could someone please guide me on what numbers to use on the commands to fix this? Thanks SO MUCH!!***Here are the testutil output:First MS Data:Second MS Data:And here is the output of some commands:diskutil list/dev/disk0   #:                       TYPE NAME                    SIZE       IDENTIFIER   0:      GUID_partition_scheme                        *500.3 GB   disk0   1:                        EFI EFI                     209.7 MB   disk0s1   2:          Apple_CoreStorage                         124.4 GB   disk0s2   3:                 Apple_Boot Recovery HD             650.1 MB   disk0s3   4:       Microsoft Basic Data                         374.7 GB   disk0s4   5: DE94BBA4-06D1-4D40-A16A-BFD50179D6AC               316.7 MB   disk0s5/dev/disk1   #:                       TYPE NAME                    SIZE       IDENTIFIER   0:                  Apple_HFS Macintosh HD           *124.0 GB   disk1                                 Logical Volume on disk0s2                                 618D45EA-42F6-4E8F-8C0C-11C419B44F6B                                 Unlocked Encrypteddiskutil cs listCoreStorage logical volume groups (1 found)|+-- Logical Volume Group 3150CA6E-B4F8-4AE6-9ED5-C3A777102C24    &#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;    Name:         Macintosh HD    Status:       Online    Size:         124352114688 B (124.4 GB)    Free Space:   45056 B (45.1 KB)    |    +-&lt; Physical Volume D5E08C6A-D721-4DFE-B3CC-5A7104B4FFC6    |   ----------------------------------------------------    |   Index:    0    |   Disk:     disk0s2    |   Status:   Online    |   Size:     124352114688 B (124.4 GB)    |    +-&gt; Logical Volume Family AB488CE1-718A-48BB-AF64-56C0D53F4AFE        ----------------------------------------------------------        Encryption Status:       Unlocked        Encryption Type:         AES-XTS        Conversion Status:       Complete        Conversion Direction:    -none-        Has Encrypted Extents:   Yes        Fully Secure:            Yes        Passphrase Required:     Yes        |        +-&gt; Logical Volume 618D45EA-42F6-4E8F-8C0C-11C419B44F6B            ---------------------------------------------------            Disk:                  disk1            Status:                Online            Size (Total):          123999748096 B (124.0 GB)            Conversion Progress:   -none-            Revertible:            Yes (unlock and decryption required)            LV Name:               Macintosh HD            Volume Name:           Macintosh HD            Content Hint:          Apple_HFSgpt -vv -r show /dev/disk0gpt show: /dev/disk0: mediasize&#x3D;500277790720; sectorsize&#x3D;512; blocks&#x3D;977105060gpt show: /dev/disk0: Suspicious MBR at sector 0gpt show: /dev/disk0: Pri GPT at sector 1gpt show: /dev/disk0: Sec GPT at sector 977105059      start       size  index  contents          0          1         MBR          1          1         Pri GPT header          2         32         Pri GPT table         34          6                 40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B     409640  242875224      2  GPT part - 53746F72-6167-11AA-AA11-00306543ECAC  243284864    1269760      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC  244554624       1152          244555776  731928944      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7  976484720       1680          976486400     618496      5  GPT part - DE94BBA4-06D1-4D40-A16A-BFD50179D6AC  977104896        131          977105027         32         Sec GPT table  977105059          1         Sec GPT headerAgain, thank you very much for the help 🙂

Loner T · Answer

1. Please use /dev/rdisk0, if possible.2. You have a Windows RE which is GPT 5.3. Can you post the output of     sudo dd if&#x3D;/dev/rdisk0s4 count&#x3D;1 2&gt;/dev/null | hexdump -C     sudo fdisk /dev/disk04. The GPT manipulation may not help because it is used to synchronize GPT with MBR after a valid NTFS partition is located. Your Testdisk output just shows the WinRE.5. Is the Testdisk output from a Quick Search or a Deeper Search?

angeliti · Answer

There you go:sudo dd if&#x3D;/dev/rdisk0s4 count&#x3D;1 2&gt;/dev/null | hexdump -C00000000  eb 58 90 2d 46 56 45 2d  46 53 2d 00 02 08 00 00  |.X.-FVE-FS-.....|00000010  00 00 00 00 00 f8 00 00  3f 00 ff 00 00 a0 93 0e  |........?.......|00000020  00 00 00 00 e0 1f 00 00  00 00 00 00 00 00 00 00  |................|00000030  01 00 06 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|00000040  80 00 29 00 00 00 00 4e  4f 20 4e 41 4d 45 20 20  |..)....NO NAME  |00000050  20 20 46 41 54 33 32 20  20 20 33 c9 8e d1 bc f4  |  FAT32  3.....|00000060  7b 8e c1 8e d9 bd 00 7c  a0 fb 7d b4 7d 8b f0 ac  |{......|..}.}...|00000070  98 40 74 0c 48 74 0e b4  0e bb 07 00 cd 10 eb ef  |.@t.Ht..........|00000080  a0 fd 7d eb e6 cd 16 cd  19 00 00 00 00 00 00 00  |..}.............|00000090  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|000000a0  3b d6 67 49 29 2e d8 4a  83 99 f6 a3 39 e3 d0 01  |;.gI)..J....9...|000000b0  00 00 56 14 00 00 00 00  00 b0 0a 1f 1d 00 00 00  |..V.............|000000c0  00 60 55 39 3a 00 00 00  00 00 00 00 00 00 00 00  |.&#x60;U9:...........|000000d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|*00000100  0d 0a 52 65 6d 6f 76 65  20 64 69 73 6b 73 20 6f  |..Remove disks o|00000110  72 20 6f 74 68 65 72 20  6d 65 64 69 61 2e ff 0d  |r other media...|00000120  0a 44 69 73 6b 20 65 72  72 6f 72 ff 0d 0a 50 72  |.Disk error...Pr|00000130  65 73 73 20 61 6e 79 20  6b 65 79 20 74 6f 20 72  |ess any key to r|00000140  65 73 74 61 72 74 0d 0a  00 00 00 00 00 00 00 00  |estart..........|00000150  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|*00000190  00 00 00 00 00 00 00 00  78 78 78 78 78 78 78 78  |........xxxxxxxx|000001a0  78 78 78 78 78 78 78 78  78 78 78 78 78 78 78 78  |xxxxxxxxxxxxxxxx|*000001e0  78 78 78 78 78 78 78 78  ff ff ff ff ff ff ff ff  |xxxxxxxx........|000001f0  ff ff ff ff ff ff ff ff  ff ff ff 00 1f 2c 55 aa  |.............,U.|00000200sudo fdisk /dev/disk0Disk: /dev/disk0 geometry: 60821/255/63 [977105060 sectors]Signature: 0xAA55         Starting       Ending#: id  cyl  hd sec -  cyl  hd sec [     start -       size]------------------------------------------------------------------------1: EE 1023 254  63 - 1023 254  63 [         1 -     409639] &lt;Unknown ID&gt;2: AC 1023 254  63 - 1023 254  63 [    409640 -  242875224] &lt;Unknown ID&gt;3: AB 1023 254  63 - 1023 254  63 [ 243284864 -    1269760] Darwin Boot4: 0C 1023 254  63 - 1023 254  63 [ 244555776 -  731928944] Win95 FAT32L5. I think it&#x27;s from a Quick Search. The one you have to wait for a while with an output like thisDisk /dev/disk0 - 500 GB / 465 GiB - 977105060 sectors (RO)Analyse sector   200245248/977105059: 00%check_FAT: Unusual media descriptor (0xf0!&#x3D;0xf8)Warning: number of heads/cylinder mismatches 16 (FAT) !&#x3D; 1 (HD)Warning: number of sectors per track mismatches 32 (FAT) !&#x3D; 1 (HD)EFI System                    40     409639     409600 [EFI]  ...Thanks so much!!

Loner T · Answer

The header is not valid. Can you run the dd command on /dev/rdisk0s5? You may need to run deeper search.

angeliti · Answer

Loner T · Answer

Your GPT 4 entry is 244555776  731928944      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7Your MBR4 entry is 4: 0C 1023 254  63 - 1023 254  63 [ 244555776 -  731928944] Win95 FAT32Lwhich match each other. You also have a valid NTFS header. Let us try a simple fix first. Please ignore i386 MBR error in the following steps, but not any other errors.sudo fdisk -e /dev/disk0pwysetpid 407flag 4pwy

angeliti · Answer

Tried that, but I still cannot boot on Windows 😟sudo fdisk /dev/disk0Disk: /dev/disk0 geometry: 60821/255/63 [977105060 sectors]Signature: 0xAA55        Starting      Ending#: id  cyl  hd sec -  cyl  hd sec [    start -      size]------------------------------------------------------------------------1: EE 1023 254  63 - 1023 254  63 [        1 -    409639] &lt;Unknown ID&gt;2: AC 1023 254  63 - 1023 254  63 [    409640 -  242875224] &lt;Unknown ID&gt;3: AB 1023 254  63 - 1023 254  63 [ 243284864 -    1269760] Darwin Boot*4: 07 1023 254  63 - 1023 254  63 [ 244555776 -  731928944] HPFS/QNX/AUX

Loner T · Answer

Can you try Windows Safe Mode? If that does not work, try Windows Startup Repair.

angeliti · Answer

I can&#x27;t 😟This is what happens:1. I turn on the computer with the ALT key pressed2. I see both partitions and choose Windows3. Bitlocker screen loads. I enter password4. I get a boot errorIf I choose to boot in Safe Mode, the same thing happens. And if I try to boot from a USB drive, I don&#x27;t get the Repair option.I guess the problem is that Windows is unable to find the partition with the Windows OS.

angeliti · Answer

Tried deeper search as well (before doing the fdisk changes), in case it helps.When I &#x27;P&#x27; the two last MS Data I get the same result as with the Quick Search.

Loner T · Answer

You are scanning /dev/disk0. Can you scan /dev/rdisk0?

angeliti · Answer

There you go:Do I need to do a Quick Search as well?

Loner T · Answer

Yes, please.

angeliti · Answer

There you go:If try to list files, first MS Data is "Can&#x27;t open filesystem. Filesystem seems damaged". Second one contains ".", "..", and "System Volumen Information".

angeliti · Answer

The BitLocker code loads fine, so it looks like the key is to understand how BitLocker knows what partition to unencrypt and boot from. It should be disk0s4, but the Yosemite update changed something and now BitLocker cannot find it.

Loner T · Answer

We need to run a Deeper Search.Can you turn off FileVault2? It can take a long while to decrypt the disk and if we do, it requires starting Testdisk again as well. Please decide what you are comfortable doing.