We are currently upgrading to 9.1 from 9.0.

I followed instructions as detailed on this link

However when i was running mode=upgrade. It just returned a blank screen.

I did check the logs on Portals\_default\logs\ and was able to resolve the issues being raised. And I redo the upgrade again.

This time there were no other logs.

EventVwr no issues being logged that could relate to the upgrade.

I tried this multiple times. Restore again and again and start new upgrade with no luck.

Is there a better way of troubleshooting this thing.

Any help will be highly appreciated.

Thanks