If your goal is simply to use cheaper ink, check if your ink supplier offers a "new generation" chip that is compatible with the latest HP firmware updates.
Have you successfully used this new downgrade method on your HP OfficeJet Pro 8620? Share your firmware version and experience in the comments (on our forum) – but be aware HP may be watching.
Upload the older firmware
Ensure the file is exactly for the series to avoid permanent damage. Step 3: Execute the Downgrade
Final thoughts Downgrading firmware isn’t for everyone — it’s a last-resort tool when a recent update harms your daily experience and other fixes fail. It restored my OfficeJet Pro 8620’s previous snappiness and fixed the AirPrint flakiness, but it also required patience and care. If you go down this path: document every step, keep backups of settings, and be prepared to restore to the latest firmware if you hit unexpected issues.
: The printer may become permanently unusable if the process is interrupted.
When installing HP software, choose Customize and uncheck HP Update .