Upgrading can be done release-to-release only.
4.3->4.4->4.5->4.6->4.7 and in a couple of months, 4.8.
This is automated, but there are some semiautomatic steps, most of which can be done with sysmerge(8), which is not in 4.3, but is in 4.4 and above. Follow each release's upgrade guide. Or, conduct a fresh installation, and rebuild your firewall and other services.
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