: I put the rule in /lib/udev/rules.d/77-mm-usb-device-blacklist.rule
Yes I rebooted the router after making the change. In the logs it shows modem manager has failed to connect to ttyUSB1 but I still can't use gcom correctly until modem manager is not connected. Once modemmanager is disabled the ttyUSB1 works fine with gcom. Could you send the full debug log, including MM booting from scratch, to see how the rules are loaded?
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