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Please note: there are some other commands, which try to delete any variable ending with "=" character, assuming that this is an empty variable. Unfortunately, there are some variables, which are containing Base64 content (e.g. passwords) and they end with "=" character too!!!
Please note 2: Do not change the icons/assign names of/to network devices in the DHPC Server settings - they will persists in the custom_clientlist variable till next reset to factory default! (I've found there devices, which aren't on my network anymore for a long-long time)