filevault decrypt couldn't start decryption "err = -69755"

Question

I&#x27;ve got a "paused" filevault decryption on OSX 10.10.5.  (iMac (21.5-inch, Mid 2011))It was getting sluggish and so thought I would turn off filevault and it appears to have gotten stuck.I&#x27;ve tried to follow a number of suggestions in other posts but not getting it to work.What I tried:1) reset pram, then reboot to recovery, use Disk Utility to unlock drive and then run repair.2) reboot to recovery, use terminal to "fdesetup disable" in this case I get:# sudo fdesetup disablePassword:Enter a password for &#x27;/&#x27;, or the recovery key:.Error: couldn&#x27;t start decryption: err &#x3D; -697553) reboot to recovery, use terminal to "diskutil cs revert"no luck4) tried "fdesetup status" and get "FileVault is Off." ????  But from below list, encryption is still on and decryption is "paused"5) running "diskutil cs list" gives:CoreStorage logical volume groups (1 found)|+-- Logical Volume Group 78D93233-1558-4869-AF0A-A84F22149BCF    &#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:         999345127424 B (999.3 GB)    Free Space:   0 B (0 B)    |    +-&lt; Physical Volume C77610CC-A2ED-47E5-8AA2-5BCFB8BA16BC    |   ----------------------------------------------------    |   Index:    0    |   Disk:     disk0s2    |   Status:   Online    |   Size:     999345127424 B (999.3 GB)    |    +-&gt; Logical Volume Family EFC1FACF-C5BA-44AD-8354-4E56F4E7DDC7        ----------------------------------------------------------        Encryption Status:       Unlocked        Encryption Type:         AES-XTS        Conversion Status:       Converting        Conversion Direction:    backward        Has Encrypted Extents:   Yes        Fully Secure:            No        Passphrase Required:     No        |        +-&gt; Logical Volume C501B6CC-CCCE-4495-A559-85501BEBA36E            ---------------------------------------------------            Disk:                  disk1            Status:                Online            Size (Total):          999026356224 B (999.0 GB)            Conversion Progress:   Paused            Revertible:            No            LV Name:               iMac HD            Volume Name:           iMac HD            Content Hint:          Apple_HFSSo I&#x27;m stuck.I don&#x27;t want to delete and reinstall.  There has to be an easier way?Thanks in advance for any suggestions.

trigas · Answer

Try plug in the power. I&#x27;m decryption and external drive and it immediately started decrypting. For some reason there&#x27;s not message or log about it!!!

keg55 · Answer

Judging from your output from diskutil cs list, it appears your drive is no longer Revertible (Revertible:  No). I&#x27;m thinking regarless what you try, you won&#x27;t be able to revert it and will have to erase and restore or reinstall.If it were me, I would clone my drive to an external USB drive then restart into the clone, erase my internal drive then clone back over to it. SuperDuper! and Carbon Copy Cloner are excellent cloning software and I think both have a trial period you can use. You can also clone without these if you have an external drive equal to or greater in size. Just restart into your internal drive&#x27;s Recovery HD and use Disk Utility / Restore to the external drive. This does a block-copy which includes the Recovery HD. Then afterwards, repeat this same procedure only boot from the external&#x27;s Recovery HD, launch Disk Utility, erase your internal drive and use Restore to restore from the external to the internal drive.