After updating to macOS High Sierra on MacBook Pro, when I try to convert the Macintosh HD to APFS (Encrypted), the encryption process is permanently paused at 10.0% for no reason then the system crashes. Then I boot into macOS Recovery mode, I can unlock the volume using Terminal but when I try to decrypt I got the following message:
"Error starting background decryption of APFS volume: The given APFS volume is already encrypting or decrypting (-69573)"
It has been a long time that Apple finally has released a new default file system called APFS. APFS comes with many new features. The most attracting one is native encryption support. Unlike the full-disk version of FileVault encryption, APFS supports file system encryption which can be used to encrypt user data, metadata and individual piece of files.
Sometimes however, when attempting to decrypt an APFS encrypted volume in Terminal, you may receive error messages like "the given APFS Volume is already encrypting or decrypting (-69573)" or "APFS volume decryption failed to begin". It's so desperate especially if you have important files on the APFS encrypted volume. Unable to unlock an APFS volume and worry about data loss on it? Don't be panic, here you can find the best solution.
Why the given APFS volume is already encrypting or decrypting?
As the error said, you can't decrypt the APFS encrypted volume as the encryption of an APFS volume is in progress. This error happens when APFS encryption stuck for some reasons but the system doesn't realize it. The reason why APFS encryption stuck is virus attack, bad sector, power failure, file system corruptions, etc. After learning what cause 'the given APFS volume is already encrypting or decrypting' error, you should think about how to fix the error.
Fix ‘the given APFS volume is already encrypting or decrypting' error
Since the APFS encryption paused, you can try to resume, cancel or disable the encryption. If you fail, the only way to reformat the APFS encrypted volume and reinstall macOS. But if the volume contains important data, please perform data recovery at first.
Recover lost data from encrypted APFS volume
iBoysoft Data Recovery for Mac is the best APFS data recovery software, which is able to recover lost data after APFS encryption paused, recover lost data from encrypted APFS volume, recover deleted/lost data from APFS volume, recover lost data from formatted APFS drive, recover lost data from unmountable APFS drive, recover lost data from inaccessible APFS drive, recover lost data from corrupted APFS drive, recover deleted/lost APFS volume, etc.
Furthermore, iBoysoft Data Recovery for Mac supports data recovery from drives formatted as other file system (such as HFS, HFS+, FAT32 and exFAT) on hard drive, SSD, fusion drive, external hard drive, USB flash drive, SD card, memory card, etc. The program is compatible with macOS Catalina 10.15/Mojave 10.14/High Sierra 10.13/10.12/10.11/10.10/10.9/10.8/10.7.
Tutorial to recover lost data from APFS encrypted volume with iBoysoft Data Recovery for Mac:
Step 1: Free download, install and launch iBoysoft Data Recovery for Mac.
Step 2: Click "Find Lost APFS Partition" on the top right corner. Then you will see all connected hard drives.
Step 3: Select the drive which contains your APFS encrypted volume and click "Next" button. The software will list all APFS volumes on the selected drive.
Step 4: Choose the APFS encrypted volume that you want to recover lost data from and click "Next".
Step 5: Enter the correct password and click "OK" to start searching for lost files on the volume.
Step 6: Preview the listed searching results, choose files you need, then click "Recover" to get lost files back.
Step 7: Go through to make sure you have all the lost files back.