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The printer is always offline when connected to WiFi, and loses connection after changing the router. Ninety percent of the cases are due to these three reasons.
Changed routers and printers, but now they're offline and can't find the icons? Don't rush to reinstall the driver yet. Check the lights, check the router device list to distinguish whether it's a network drop or disconnection, change the IP port and port, only recognize 2.4G on the network card, and reconfigure the network after changing the WiFi name. The three real culprits are identified accordingly. I fixed it in half an hour following this order....

