Hi. Is it possible to replace the shipped power supply, 2,1A with a 2,4A power supply? Or is this bad for the Homey?

That’s not a problem. 2.1A or 2.4A only means that the adapter can deliver it, not that it does.
Voltage is also important. 5V.
But is this for the Homey Pro 2023?
There, the adapter did not deliver enough voltage.
The replacement adapter for Homey Pro 2023 is 5,2V and 2,1A.
Homey Pro 23

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In that case you have a Homey Pro (Early 2023)

There was already a topic for.