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Bluetooth has a very limited range and the signal can be blocked easily by shelves and other materials.
If you get this error message when trying to print over Bluetooth:
Then the printer's Bluetooth security level is set too high and needs to be set to lower.
Follow these steps to lower the Bluetooth security level:
Step 1)
Connect to the printer using the Printer Setup app.
Step 2)
Go to Connectivity settings, then Bluetooth.
Step 3)
Hit next in this windows
Step 4)
Set minimum Bluetooth Security mode to 1 and then hit next.
Step 5)
Hit apply and then if then accept the request to restart the printer, the printer should now be good to go.
