Exchange Server 2016 CU8 upgrade crashed and corrupted everything resulting in an unrecoverable state. Fortunately, all emails are stored on O365, Hybrid exchange is only for SMTP relay and account creation.
You are to rebuild a Hybrid Exchange 2016 CU8 from scratch.
FYI...recover install did not work. ECP was not accessible due to lack of the database.
Less than 30 hrs/week
Less than 1 month< 1 monthProject LengthDuration
I am looking for a mix of experience and value