If the printer LCD screen continues to display the same error message, do the following:
Remove both cartridges from the printer.
Move the Red Lock Switch (at the back of the printer) from the down position to the up position, and then move it back to the down position.
Unplug the printer and turn it onto its left side.
Then return the printer to its upright position and reapply the power supply.
Attempt this fix twice and then try to print and scan once more.
NOTE: Installing the wrong upgrade file will not cause damage to the printer, but the LCD display will display some characters incorrectly. Downloading and installing the correct Firmware will resolve the issue.
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That means you have to "Unlock" it physically, there will be a lock/unlock device at the side underneath etc, that you move to "Release" the Scan head. When shipped it is "Locked" to prevent damage. the first time it is used you "Unlock" it.
I had the same problem and the solution is this: There is a red lever switch by the power chord on the scanner/printer. Above this red lever switch is the drawing of a lock in the "locked" position and at the bottom this red lever switch is the drawing of a lock in the "opened (unlock)" position. The lever on the red switch should point to the "opened" lock symbol (unlock). It the switch lever is pointing to the "locked" position of the lock symbol, flip it to the "opened" position and recycle power on the scanner by removing the power chord for a 30 seconds. If the lever is pointing to the "unlock" lock symbol, flip it to the "locked" position and then back to the "unlocked" position and recycle power. Good luck!