Brother error code Unusable Device
Quick answer
A broken or unsupported USB device (camera, flash drive, or high-power-draw device) was connected to the machine's USB direct interface. Disconnect the device and power-cycle the machine.
Before you try the solution
- 1. Copy the complete message exactly as shown, including any letters, spaces, or punctuation around Unusable Device.
- 2. Find the printer's exact model number. The same-looking code can mean something different on another model family.
- 3. Let the current print, scan, or update operation stop before touching controls, paper paths, or covers.
Manufacturer-documented solution
A broken or unsupported USB device (camera, flash drive, or high-power-draw device) was connected to the machine's USB direct interface. Disconnect the device and power-cycle the machine.
Model scope: Brother's Error and Maintenance Messages for your exact model
If the error is still there
- 1Return to the screen or job that produced the message and check whether the code has cleared.
- 2If Unusable Device returns, do not repeat a risky procedure. Record when it appears and check the documentation for the exact model.
- 3If the documented action does not clear Unusable Device, contact Brother support or a qualified printer technician with the model number and complete message.
Other Brother error codes
- 2-sided DisabledThe back cover is not fully closed, or the 2-sided (duplex) tray is not installed correctly, so duplex printing is disabled. Close the back cover completely and reseat the duplex tray.
- Authentication Error 01The four-digit PIN entered for a Web Connect service account doesn't match the registered account PIN. Re-enter the correct PIN.
- Authentication Error 02The temporary ID used to link a Web Connect account is wrong, already used, or expired (temporary IDs are valid only 24 hours). Get a new temporary ID and retry.
- B&W Print OnlyOne or more colour ink cartridges have reached end of life. The machine still prints in black and white for roughly four weeks before stopping.
- Cannot DetectAppears when a new ink cartridge was installed too quickly, a non-Brother cartridge was used, or the cartridge isn't seated correctly. Remove and reinstall the cartridge slowly until it clicks into place, using genuine Brother ink.
- Cannot Detect Ink VolumeThe machine cannot measure the remaining ink. Brother attributes this to non-genuine ink not being detected. Also displayed as "Cannot Detect Ink".
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Manufacturer reference
The meaning and documented action above were taken from the manufacturer source below.
Error and maintenance messagesVerified against manufacturer documentation, last checked 2026-08-13. PrintDiag has no printers and no technician, so nothing here is claimed as tested on hardware.