A Master Lock Pro Series #6321 padlock with BumpStop is bumped in just two attempts. This requires a special bump key that is cut slightly differently from "normal" bump keys. This will not work with a bump key that you buy online or from a locksmith supply catalog. I contacted Master Lock about this but they did not want to hear about it. This seems to be a trend with lock companies. A problem is found in the lock, the company makes a fix for the problem, the fix is defeated, and then the company insists that the fix works, wasn't defeated, the video was faked, etc. We've already seen this with Medeco and with Master's Anti-shim padlocks.
There are other videos of BumpStop locks being bumped, but they are all damaged or improperly pinned. This lock is unmodified and factory pinned, in near-mint condition. The cylinder has never been removed.
The trick to making a BumpStop bump key is to cut the notches slightly higher than usual, and cut the one where the BumpStop pin is much higher than usual. You might have to make a set of several bump keys with the notches at different heights and positions to open all BumpStop locks, but then again you also have to make several bump keys with several different sidebar cuts for Medeco.
The only two locks that I'm aware of that have never been bumped are Abloy and BiLock. Medeco, Mul-T-Lock, Schlage Primus, and many others all claimed to be bump proof, but were eventually bumped. I don't think BiLock will ever be bumped, and Abloy definitely won't because it isn't a pin-tumbler lock.
Now, for the legal stuff: I am not responsible for what you do with this information. Please only use this for legal purposes and only on your own locks. Don't break the law. Crime doesn't pay.