Do I need to install a keyboard overlay on the E57540c?
Some languages require installing a keyboard overlay on the E57540c model. Pull the keyboard out, peel the paper backing from the overlay at a sharp angle, align the top corners to the esc and delete keys, press the labels firmly in place, and then peel off the clear sheet.
From the official HP Color LaserJet Managed MFP E57540 Multifunction Printer manual, page 5
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