After successful downgrade, the printer will auto-update within 24 hours if connected to the internet.
Several online services (search "HP 8620 firmware downgrade service") provide:
These are your only option if current firmware is ≥1743A.
"Did this work on your 8620? Tell me the last 4 digits of your old firmware in the comments. If you see 'Update blocked by admin,' you need to perform a factory reset before starting Step 3."
Before we dive into the downgrade process, let’s understand the battlefield.
HP employs a security system called Dynamic Security. It’s designed to ensure only cartridges with new HP chips work. Every few months, HP releases a new firmware update that “improves security” – a euphemism for breaking compatibility with non-HP cartridges. hp officejet pro 8620 firmware downgrade new
If you’ve recently updated your OfficeJet Pro 8620 (whether intentionally or via an automatic update), you’ve likely encountered:
The only way to reverse this is a firmware downgrade. HP doesn’t advertise this, but the pre-Dynamic Security firmware versions still exist – and they work perfectly.
Before attempting the downgrade, understand the risks:
| Risk | Consequence | |------|--------------| | Bricking | If power is lost during the 12-minute flash, the printer becomes a paperweight. | | Voided Warranty | HP will refuse support. (But the 8620 is out of warranty for most users anyway.) | | Security Vulnerabilities | Older firmware lacks patched exploits. Do not connect the printer directly to the internet after downgrade. | | HP Apps Failure | HP Smart and ePrint will break. You must print via USB or LAN only. |
If you accept the risks, proceed.
Warning: Downgrading printer firmware can brick the device, remove features, or void warranties. Proceed only if you understand the risks.
What you need
Step-by-step downgrade (USB method — safest)
If USB method not available — using Embedded Web Server (EWS) / Network:
Troubleshooting
Alternative options
Legal and warranty notes
If you want, I can:
Disclaimer: Downgrading firmware can violate HP’s warranty, introduce security vulnerabilities, and may cause functional issues. HP actively blocks downgrades on many devices. This guide is for educational purposes. Proceed at your own risk.