Downgrading the HP OfficeJet Pro 8620 Go to product viewer dialog for this item.
firmware is a common method for bypassing "Dynamic Security" or "Non-HP Chip Detected" errors that block third-party ink cartridges. Quick Summary
Current Status (April 2026): HP does not officially support downgrading. Newer firmware (like FDP1CN2022AR ) is often locked to prevent reverting.
Primary Risk: Interrupting a firmware flash can permanently "brick" (disable) the printer. Prerequisite: You must find an older version (e.g., version or
) from a third-party source or backup, as HP has removed these from their official support pages. 🛠️ Step-by-Step Downgrade Process
If you have an older firmware file (typically a .exe for Windows or a .ful / .rfu file), follow these steps: hp officejet pro 8620 firmware downgrade new
Prepare the Connection: Connect your printer to your computer via a USB cable for stability; avoid Wi-Fi for firmware tasks. Enable "Allow Downgrade":
On the printer screen, go to Settings > Printer Maintenance > Update Printer. Select Manage Updates and set Allow Downgrade to Yes. Run the Older Firmware:
Windows: Double-click the downloaded firmware .exe and select your printer from the dropdown menu. Click Update.
Mac/Terminal: If you have an .rfu file, you can send it via Terminal using the command: nc -w 100 [Printer_IP] 9100 < firmware_file.rfu.
Wait for the Reboot: The printer screen may turn green or display a progress bar. Do not turn it off. It will print a status report once complete. 🔒 Disabling Future Updates Downgrading the HP OfficeJet Pro 8620 Go to
To prevent the printer from automatically re-installing the problematic firmware:
On the Printer: Go to Settings > Printer Maintenance > Update Printer > Printer Update Options and select Do Not Check.
On your PC: When installing HP software, choose Customize and uncheck HP Update.
HP OfficeJet 8620 previous firmware update... - HP Community
Short answer: Yes, but with significant caveats. New 2025: How to Downgrade HP OfficeJet Pro
Long answer: HP typically prevents downgrading to older firmware versions (anti-rollback). However, the OfficeJet Pro 8620 is a legacy device (discontinued by HP in 2022). Recently, security researchers discovered a signature bypass in the bootloader of the 8620’s specific firmware revision. This allows a manual downgrade to version 1.7.4 (the last known “open” firmware) from any newer version, including the latest 2025 release.
"Downgrading may void your HP warranty or Instant Ink subscription. This process is for educational purposes. HP may have patched this method with recent silicon-level updates. If your printer has firmware 2000A or higher, downgrade is physically impossible due to OTP fuse burning."
Common errors:
Solution: Install the newest old firmware you can find (e.g., 1739A instead of 1709A). Some versions allow a single-step back.
After downgrading, hold the Wireless button and Cancel button for 5 seconds to disable HP Web Services entirely. No web services = no automatic updates.
hpsf.hpcloud.hp.comfwupdates.hp.comhpfirmware.hp.comIn the hidden menu: