Brother International MFC-L8850CDW Basic Users Guide - Page 131
Unusable Device, Remove the, Device. Turn the, power off and back, on again., Write-protected
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Troubleshooting Error Message Unusable Device Remove the Device. Turn the power off and back on again. Unusable Device USB Write-protected WT Box End Soon Cause A defective USB device or a high power consumption USB device has been connected to the USB direct interface. Action Unplug the device from the USB direct interface. Press and hold down to turn the machine off, and then turn it on again. A USB device or USB flash drive that is encrypted or not supported is connected to the USB direct interface. The protect switch of the USB flash drive is on. The waste toner box is near the end of its life. Unplug the device from the USB direct interface (see the specifications for supported USB flash drives in Printing from a USB flash drive or digital camera supporting mass storage on page 67). Turn off the protect switch of the USB flash drive. Buy a new waste toner box before you get a Replace WT Box message. B 119