HP LaserJet printers provide a number of ways to update the system firmware, some of which are easier or more effective than others. My favorite method so far: use curl to upload the new firmware via FTP.
First, download the firmware file from HP's support website. Then, just push it to the printer...
curl -T ./hp_firmware_file.rfu ftp://myprinter.mydomain
Can be scripted to run in batches too. :)
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