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I could update from beta 4 to beta 6, too. But only after I disabled the firmware password (again).

Interesting. My MacBook Pro also has a replaced 1TB SSD (the previous 1TB SSD failed and got exchanged in an Apple Store).

Same problem with my MacBook Pro (2013), had to restart in Recovery Mode and restore a previous local snapshot.I also filled a bug report (rdar://42807895) for this issue. Let's hope they fix this with the next beta.

I discovered the problem. Sometime during development I deactivated the "Create" permission for the record for the "Authenticated" security role by accident in the CloudKit Dashboard while having the "Read" and "Write" permissions for the record for the "Creator" security role still activated. Reactivating the "Create" permission for the record for the "Authenticated" security role fixed the issue. Somehow the security roles got ignored in the Development enviroment, but were rightfully enforced in the Production enviroment.(I just rediscovered this topic and wanted to add the solution for people that might get here via search)