HP removed old firmware from their site. Try:

Once you have successfully downgraded or if your printer currently works with third-party ink, you must disable automatic updates to prevent the printer from locking again. HP Support Community

Hp Officejet Pro 8620 Firmware Downgrade Hot -

HP removed old firmware from their site. Try:

Once you have successfully downgraded or if your printer currently works with third-party ink, you must disable automatic updates to prevent the printer from locking again. HP Support Community

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