I guess pretty much any bread knife is a bifl one, but in the twenty odd years i’ve had this, i keep thinking to myself that this knife is awesome basically any time i use it. That’s why i want to recommend it. When I bought it it was quite cheap too, does not seem to be the case anymore. Is a Victorinox 5.2930.26
I was once told their knives are not supposed to be sharpened. Or at least at a home setting. I was in a store, so I automatically take every word told to me with an extra grain of salt.
Never done it, but sharpening a serrated blade is not an easy task. Most will just wear down such a blade until rendered unusable and discard it afterwards.