Upgrade path from 18.06.1

I just found out how old my openWRT version is and need a bit of advice which path is likely the best to update from 18.06.1 to the actual stable version.
running on a APU 2C2 hardware.
(saving the configuration is a given)
Do I first step to the last 18.6. and then the each last major version? Do I save the config install anew and load the config (I guess that might fail due to differences on that big leap).
Thanks in advance.

nope.

you'll need to reset your settings, I think x86 have been migrated to DSA.

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Take a config backup. Then flash the latest image for your device. Restore the settings manually, using the backup as a reference only. In some cases, e.g the firewall configuration, you might be able to copy/paste the old config, but verify it first not to brick the router or lock yourself outside.

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The APU boards don't have a switch, so that doesn't matter (and I'm not sure if there are any supported x86 devices with a switch anyway).

But starting with a fresh configuration is probably still a good idea when upgrading from such an old version.

good point!