when you migrate the configuration you get this error:
The model number must not be lower than the base model:


->> solution / workaround:
in configuration file search for a line like
<base-model>X5500e</base-model>

>> remove the model number and save file and try again



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kb article: https://techsearch.watchguard.com/KB?SFDCID=kA1Vr000000DVArKAO

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