def METHOD_NAME(self, old: bytes, new: bytes) -> bool:
    """
    Item is updatable if the new value is the same or
    it changes 1 to 0 only (the flash memory does not
    allow to flip 0 to 1 unless you wipe it).
    """
    if len(old) != len(new):
        return False
    if old == new:
        return True
    for a, b in zip(old, new):
        if a & b != b:
            return False
    return True