I’m getting ready to migrate my stable HA on a PI3b+ to a PI4b. In the past when I’ve wanted to move my HA from one PI3 to another PI3, just moving the SD card from one to the other did the trick without fail.
Anybody try that moving from a PI3 to a PI4? Or should I rebuild and restore from backup?
That won’t work, the OS layer isn’t compatible.
Take a backup, restore it on a fresh install on the new Pi, and while you’re at it move to using an SSD (on a powered USB hub).
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