Intel MacBook Air 2020 - Catalina - Failed update....

[ndlsfg]

Hi, I have a MacBook Air running Catalina. A security update install failed and I'm not able to login to the only user account. I have Filevault enabled, if I try to reset my user password using my Apple ID I am advised that "There are no users on this volume to recover" - I've tried to run disk first aid but I am not able to unlock the drive as again my usual user password isn't accepted despite it being correct. It's looking like I will need to wipe and install however if any one has any recommendations before I would be grateful.

Thanks

 

[MacsBug]

Have you tried to either boot with an External drive, or connect it to another Mac using Traget Disk Mode. to see if you can unlock the FileVault volume?

 

[ndlsfg]

Have you tried to either boot with an External drive, or connect it to another Mac using Traget Disk Mode. to see if you can unlock the FileVault volume?

Yes I should have mentioned I tried a USB installer, could get to disk utility but nothing more without unlocking the volume. I haven’t tried target disk mode yet. If I hold alt I can either boot to update installer or usual install however can’t login as the password appears to be incorrect when it isn’t