Hp Officejet Pro 8620 Firmware Downgrade New May 2026

If the downgrade fails mid-process, the printer can become a permanent brick (no display, no USB detection). The only fix would be replacing the main logic board (~$80 on eBay).

If you are looking for a downgrade, you already know why. HP’s infamous Dynamic Security feature acts like a bouncer at a nightclub. It scans your ink cartridges. If they aren't HP-branded (or if they are older, "remanufactured" chips), the printer refuses to print. It turns your $200 printer into a paperweight.

The newest firmware updates (usually versions ending in 2145A or newer) have tightened the screws. They’ve updated the DRM database to block chips that used to work perfectly six months ago.

Users want to downgrade to a firmware version from 2019 or early 2020—before the aggressive lockdown—so they can use affordable third-party cartridges again. hp officejet pro 8620 firmware downgrade new

“HP recently pushed a new certificate update that breaks third-party cartridges. If your 8620 auto-updated past version 1739A (or newer), you cannot simply ‘roll back’ via the menu anymore. This guide uses a new workaround involving a USB recovery mode and a specific archived firmware file.”

Keep holding until the screen flashes orange and shows: “Emergency Mode – USB FW Recovery”.

Note: The old method used the “Back” button, but that no longer works on printers with firmware dated November 2024 or later.

Since the web interface disables downgrades, this is the current working trick. If the downgrade fails mid-process, the printer can

Step 1: Prepare the USB Drive

Step 2: Extract the Firmware

Step 3: Enter RCM (Recovery Mode) - The New Trick “HP recently pushed a new certificate update that

Step 4: Flash the Downgrade

Historically, the USB method on Mac often fails due to hidden files on formatted drives. Use a Windows PC or a Linux live USB for reliability.

Let me save you two hours of Googling: HP removed the official downgrade path.

In the past, you could visit HP’s support site, download an older .exe or .rfu file, and run it via USB. The printer would happily roll back. Today, HP’s servers block those requests. Even if you find the old file, the printer’s bootloader may reject it citing "Older version not allowed."