There are two basic upgrade paths:
1. In-place upgrade with CPUSE (which has been smooth for most customers)
2. "Advanced database upgrade" where you export the R77.30 configuration, do a fresh install of R80.10 (either booting off ISO or via CPUSE), and import the R77.30 configuration.
I recommend leveraging the R80.x Upgrade Verification and Environment Simulation service to make sure the upgrade (whichever path you take) will be smooth.
I have done upgrade 80.10 with cpuse and its very easy also upgrade gateway as well
Following up on what Dameon said, both ways should be fairly easy, but when I do upgrades such as a big one like this I prefer start fresh and clean. If you have access to a lab then you should be able to compare the two different ways(It's a great way to practice and also vet any issues that might arise)
1) Do a migrate export of your current R77.30 management server
2) Migrate import into a new R77.30 management server that's in your lab
From here you can either do an in-place upgrade or use the R80.x upgrade tools and export the database to a fresh install of R80.x
Good luck Anuj!
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