: Double-click the downloaded firmware file on your PC.
Before attempting a firmware rollback, you must prevent the printer from automatically updating itself again. HP Printer Firmware Downgrade Guide - CompAndSave hp officejet pro 8620 firmware downgrade hot
Instantly bypasses the cartridge lockout mechanism. : Double-click the downloaded firmware file on your PC
| 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 | | Feature | After downgrade | |--------|----------------| |
HP OfficeJet Pro 8620 Firmware Downgrade: The Ultimate Guide to Bypassing Cartridge Errors
