If the downgrade fails mid-process, the printer can become a (no display, no USB detection). The only fix would be replacing the main logic board (~$80 on eBay).
Select your from the device list. Click Update or Transfer . hp officejet pro 8620 firmware downgrade new
Once you have successfully downgraded to a firmware version that accepts your third-party cartridges, you must . Otherwise, the problem will return. If the downgrade fails mid-process, the printer can
| Item | Notes | |------|-------| | | Mac downgrade is unreliable for this model | | USB A-to-B cable | Network downgrades often fail; USB is critical | | Old firmware file | Version FDP32A or lower (link provided below) | | HP Downgrade Utility | Special tool, not the standard firmware updater | | Patience | Process takes 10-15 minutes; do not interrupt power | Click Update or Transfer
This method bypasses HP’s recent server-side blocks that prevented older downgrades. Follow it exactly.