This guide provides instructions for upgrading the firmware of a PDL (Programmable Data Link) device. To upgrade the firmware, users must first download the PDL/EDL operating firmware into the same directory as PDLCONF/EDLCONF. It is recommended to download the zipped version of the firmware to avoid any issues with the browser. After connecting the PDL device to the computer, users must run PDLCONF/EDLCONF and select the "Upgrade modem firmware" option from the top left corner of the screen.
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