HP L1581A - Manual (Page 11)

User’s Guide 11
Setting Up the Projector
6. Perform these steps in reverse order to install the new module, then connect power
and turn on the projector.
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If the projector displays a message saying you must update the firmware for the
projector or accessory module, see “To update the firmware” on page 51. The
projector might not work properly if the components have incompatible firmware.