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I have HP OfficeJet 8710 and I tried  firmware downgrade cmd  " lpr -S 192.168.137.180 -P 192.168.137.180 OJP8710_2105AR.rfu".  it does not work I get massage  "could not open OJP8710_2105AR.rfu for reading". I Try quite a few times but it did not work. Does anyone else have tried it or have any knowledge about it please.

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Open web browser, enter printers IP address in address bar to access printers EWS and you can find tab for firmware download.




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