Downgrading firmware carries a risk of "bricking" your printer (making it permanently non-functional). HP Support Community Wired Connection: Always use a direct

and R1640A are common targets for restoration.

After it restarts, check the Printer Status Report to confirm the version has changed. Alternative Method: USB Drive (Flash Drive) If the .exe file doesn't work: Obtain the .ful firmware file.

HP rarely hosts older versions on their official support site. You may need to find them through reputable third-party ink providers like CompAndSave Bypass "Not Applicable" Errors: