How do I upgrade HP Envy 7640 driver?

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I am working on HP Envy 7640 wireless printer for wireless printing facilities. This wireless printer is the best printing machine that allows users to print the documents wirelessly. From a long period, my HP envy 7640 wireless printer is not performing well. Its printing performance is very low, so I want to upgrade HP envy 7640 driver to the newest version. I want to improve the performance of my printing machine. While upgrading process, I am facing technical problems. So please anyone can suggest the effective ways to upgrade HP envy 7640 driver.

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