Hp Officejet Pro 8620 Firmware Downgrade Hot — Verified Source

HP printers have a hidden service menu that sometimes allows downgrade.

Enter Service Menu on HP 8620:

Inside Service Menu:

If you see this, HP has set an anti-rollback counter. Attempts to force downgrade include: hp officejet pro 8620 firmware downgrade hot

Before starting:

Insert the USB drive into your PC. Right-click it in File Explorer and select Format. Choose FAT32 (not NTFS or exFAT). Name the volume "HP_RECOVERY" (optional).

Some HP printers have open telnet on port 23 or 9100 (raw printing). Commands (rare on 8620): HP printers have a hidden service menu that

telnet 192.168.1.xxx
fwupdate -d -f /path/to/old.fu

Most 8620s have this disabled after 2018 firmware.

In the summer of 2023, HP pushed an automatic update (version 1743A or later) to the OfficeJet Pro 8620. This update did not improve print quality or speed. Instead, it activated the latest iteration of HP Dynamic Security.

What does Dynamic Security do? It blocks any ink or toner cartridge that does not contain an original HP chip. If you use remanufactured, compatible, or refilled cartridges, the printer rejects them outright, displaying an error message like: "One or more cartridges appear to be damaged. Remove them and replace with new cartridges." Inside Service Menu: If you see this, HP

For small businesses and home offices relying on affordable third-party ink, this update effectively turned a $200 printer into a brick. The "hot" demand for a downgrade comes from thousands of users refusing to pay HP’s inflated OEM ink prices for a device that is nearly a decade old.

HP introduced firmware version counters in the bootloader:

| Firmware Version | Release Date | Why It’s “Hot” | |----------------|--------------|----------------| | LDP_1834A | Late 2018 | Last version before aggressive cartridge checks | | LDP_1743A | Mid 2018 | Most stable for third-party ink | | LDP_1620A | 2017 | Old but safe fallback |

The hottest request right now is for LDP_1834A — works with most refilled cartridges.