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Delete Current Device
Go to the homepage, tap the top-right corner to enter the current device status screen, select "Delete Printer" , then click delete in the pop-up window.
2.Remove Past Devices
From the homepage, tap the top-right corner to enter the current device status screen. Select switch device icon , then choose the name of the device you wish to delete.
Once inside that device's interface, tap "Delete Printer" and click delete in the pop-up window.