If your HP OfficeJet Pro 8620 has a bootloader version that rejects old firmware, you have limited options:
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The printer's screen may change color or show a progress bar for 1–5 minutes. Do not power it off . Final Lockout Prevention hp officejet pro 8620 firmware downgrade
HP OfficeJet Pro 8620 Firmware Downgrade: The Ultimate Step-by-Step Guide
Swap your USB cable to a different port on your computer. Avoid using external USB hubs. If your HP OfficeJet Pro 8620 has a
Connect your printer directly to a reliable wall outlet. A power loss mid-update can permanently corrupt the printer's motherboard.
: On the printer's control panel, navigate to the Manage Updates menu. Touch Allow Downgrade and select Yes . Can’t copy the link right now
Connect your printer directly to your computer using a ; a wired connection is significantly more reliable than Wi-Fi for firmware changes. Ensure the printer is powered on and in a "Ready" state. Disable Automatic Updates
Understanding the motivation behind a firmware reversion helps clarify the technical steps required.
To help find the right version or troubleshoot an error code, tell me: What (Windows or Mac) are you using?