And when you reverted to a database revision in R77.30 you were able to bring back a deleted policy package but you also lost any other changes, are you sure that's what you want to do? The Installation History feature in R80+ management can only install a previously-installed known good policy back onto a gateway, it changes/restores nothing in the actual config shown in the SmartConsole.
Check out the Revert function detailed in Part 3 of my document here:
R80+ Change Control: A Visual Guide
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