In the HP Future Smart architecture, particularly in revisions released post-2017, the printer stores a "minimum firmware version" counter. If a user attempts to load a firmware package older than the minimum version recorded in the printer's secure storage, the printer will reject the update with an error (often "The firmware on this device is newer than the version you are trying to install").
HP has made downgrading very difficult on 6950 after ~2021. If you just want third-party ink to work, consider: hp 6950 downgrade firmware
If you still want to proceed, perform the downgrade offline and be prepared that it may not succeed. In the HP Future Smart architecture, particularly in
Users typically pursue a firmware downgrade for three primary reasons: If you still want to proceed, perform the
After the printer restarts: