: Official HP Support warns that forcing a downgrade can lead to "bricking" (making the printer permanently unusable) or losing critical functionality.
: Experienced users on Reddit suggest that while the official .exe installer acts as a "gatekeeper" and blocks downgrades, you can bypass this by extracting the .FUL or .RFU binary file and sending it directly to the printer via a network command (like LPR or binary copy). hp officejet pro 8620 firmware downgrade hot
: Some users report that even after bypassing initial blockers, the printer may hang indefinitely on a "Verifying" screen or simply reboot without actually changing the firmware version. : Official HP Support warns that forcing a
firmware downgrade are mixed, primarily because modern HP firmware versions are often designed to . While HP officially states that downgrading is not possible or recommended, many users pursue it to bypass "Dynamic Security" which prevents the use of non-HP ink cartridges. The "Good" Reviews & Successful Workarounds firmware downgrade are mixed, primarily because modern HP
| Feature | After downgrade | |--------|----------------| | Third-party cartridge acceptance | ✅ Full | | Refill chip reset (ARC) | ✅ Works | | Printer status page without nag | ✅ No cart guard | | HP Smart app warning suppression | ✅ Gone | | Hidden menu (Service Test Mode) | ✅ Enabled (hold Back + Cancel at ready) | | Firmware update blocking (hosts file) | ✅ Possible |