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How did you try and perform the upgrade just via the web UI?
If you upgrade via USB as an example that version will become the new default if you factory reset in future.
Note R77.20.87 should be the latest available for this model.
Upgrade paths for SMB appliances are documented in sk120512 as follows: R77.20.31 > R77.20.81 > R77.20.87
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