Stuck trying to decrypt partition
I need help! A summary of what I have been dealing with. In June my MacBook Pro crashed and wouldn't boot while trying to download files from my Go Pro camera. After researching the problem over the last few months, I'm pretty sure the OS ran out of memory and now won't boot. Since then, I would get my login screen, log in then the login screen would return. My next step was to delete some files to free up memory in safe mode. However I can't log in in safe mode because my partition is encrypted. I went in via disk utility to unlock it and then decrypt it however my Mac froze up during this process, causing me to force another reboot. Since then, when I get back into disk utility, the partition is both unmounted and locked again. I have to go into terminal to unlock it. If I try to start decryption in terminal I get error message, "Error: -69750: Unable to modify a FileVault context". Once unlocked and mounted I can go into disk utility to "turn off encryption" but two pop ups come up, top one says "Disk decryption in progress. The disk you requested to decrypt is now being decrypted in the background. You may continue to use your computer while this process completes. You can view progress in the FileVault tab of the security and privacy preference pane". Second pop up behind the first one says: "an error has occurred trying to turn off encryption.". When I went back into terminal to check progress this is what I see: (below)
What do I do next?
MacBook Pro (13-inch Mid 2010), iOS 7.1.2