If the downgrade was successful, you may need to clean the cartridge chip contacts or perform a "Factory Reset" via the Support Menu.
Unplug the Ethernet cable if your printer uses one.
Always refer to the manufacturer’s support website for official troubleshooting guides regarding cartridge errors or system bugs. hp officejet pro 8620 firmware downgrade
: Never attempt a firmware downgrade over Wi-Fi. A sudden drop in the wireless network can corrupt the installation. Connect your printer directly to your computer using a USB A-to-B printer cable.
On the printer control panel, locate the , Back , and Refresh buttons (even if they are unlit). If the downgrade was successful, you may need
Modifying your printer's firmware with third-party tools or unauthorized rollbacks will void any remaining manufacturer warranty. Step 1: Preparation and Prerequisites
Allows you to use remanufactured, refilled, or compatible cartridges freely. : Never attempt a firmware downgrade over Wi-Fi
For 90% of HP OfficeJet Pro 8620 owners, . The printer’s hardware is solid; only the software is predatory. Rolling back to firmware version FDP1CN2033AR restores your right to use affordable ink and bypasses HP’s forced obsolescence.