Toshiba e-STUDIO 5540C Service Manual page 1247

(5) Remove the internal cover.
(6) Remove the cover plate.
(7) Connect the download jig with the jig connector on the FAX board.
(8) Press the [ON/OFF] button while simultaneously holding down the [0] and [8] buttons.
Updating starts automatically and the LED on the download jig lights.
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e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
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FIRMWARE UPDATING
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