Hi! Brief 1. MacBook Pro ( Mid 2015, 15'' ). 2. Update 10.14.5 -> 10.14.6 failed. 3. SSD is broken ( adapter of this non-original SSD is broken ). 4. Error - OS can't unlock partition because it thinks that this partition has FileVault protection, but there is no FileVault protection. 5. All possible options in Recovery mode are failing. 5.1. Recover from Time Machine. -> Failed 5.2. Reinstall OS. -> Failed 5.3. Erase/First Aid partition. -> Failed. 5.4. Set startup drive. -> Failed. ( Bless can't be completed ). History I tried to install new patch 10.14.6 on my MacBook Pro ( Mid 2015, 15'' ). At the end of update I saw question mark folder. I looked up in Internet and saw solution in rebooting and login in into recovery mode. I did it and at the next restart Installer GUI showed error: "Function not implemented." I open Logs and looked for this error. OSInstallElement entry showed this error. Also I observed errors that "vm cannot be placed at path: disk is readonly". However, I see that this partition has title OS 10.14.6 in System Preferences -> Choose boot device. Also, in Logs various entries said that this volume with OS 10.14.6 is valid but it is readonly. My next steps in Recovery. 1. Set startup drive - error: "bless cannot be done on this disk". 2. Try to Recover from Time Machine - just error after I chose destination partition to restore. 3. Try to Reinstall OS - I can't choose any device, because they are greyed and GUI suggest to choose another device. 4. Try to Erase this APFS partition in Disk Utility - error: fsdk_apfs /dev/disk1_2 - Permission Denied. Error 66. 5. Try to First aid this partition - unknown error. 6. Try to First aid when this partition is disconnected - error: fsdk_apfs /dev/disk1_2 - Permission Denied. Error 66. What should I do in this situation? Could I somehow restore functionality of this SSD even with downgrade to 10.14.5? Service center suggests to replace my SSD ( 1 TB ) by original one. It is so expensive. I would like to know alternative solutions. Thanks! UPD Service center said that this SSD has adapter ( it is not original SSD ). This adapter is broken. There are two possibilities: 1. This update will break any adapter from non-original SSD. 2. This update broke only this adapter as an old adapter ( Previous owner uses this Mac for 3 years, so, maybe lifetime of this SSD-adapter is over.