We did a downgrade from 9.1.x (don't know the exact details) to 9.0.6 (in Azure). Not sure if this can be compared to your situation, since the 9.1 was not configured at all (besides the mgn interface and the local admin user). Keep in mind that the default user (admin) might not be configured. In the deployment task we provided a different user name.
Thanks for the solution, I found this to be the way to go. As a follow up to the other replies, I made another attempt to downgrade to 9.0.4 with another firewall (the HA partner) by downloading the base and attempting to install 9.0.4. Same result. 9.1.0-h3 was installed as part of a solution template I used from Github. For the replacement firewall, decided to deploy a single firewall at PANOS 9.0.4 and avoid the downgrade. Much better idea so be careful with solution templates and what they deploy.
Thanks for your responses.
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