I am also getting the "not compatible"- error.
I'm running an S5 with air manager and material station.
However, the "restart" command seems to run without issue.
Any Ideas?
C:\>C:/ut/ultituner cooldown off -p 10.2.152.186
UltiTuner 0.8.0 - Copyright by Smithy (Christian Schmied)
Connecting to the printer 10.2.152.186.....done, connected
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UM-S5
model: 214476 213483
version: 7.1.3
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Checking printer/firmware compatibility.....done, but not compatible