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I see from the post that you would like to change the EWS administrator password for your HP OfficeJet 8710 printer. Don't worry as I have a few steps to help you get through this concern,
Let's try to Restore the network to defaults which will reset the network.
To restore the printer to the original network settings
1. From the printer control panel, touch or swipe down the tab at the top of the screen to open the Dashboard, and then touch ( Setup ).
2. Touch Network Setup.
3. Touch Restore Network Settings. A message appears stating that the network defaults will be restored.
4. Touch Yes.
5. Print the network configuration page and verify that the network settings have been reset.
Here's a related HP Forum post which seems to have helped others: Click here
Let me know if those steps worked for you.
If they did, that’s awesome!
Give us some reinforcement by clicking the solution and kudos buttons,
That’ll help us and others see that we’ve got the answers!
Good Luck.
Jeet_Singh
I am an HP Employee