Upload & Sell: On
Can see why they might want to retain the capability to flash some firmwares, purely from a commerical "anti-tamper" point of view.
Giving you access to firmware, in theory can give you the workings of the electronic workings. Assuming, but you can reverse engineer the firware code.
Loosing that on a cheap 40mm vs a several thousand dollar 500mm is probably acceptble commercially.
As a guess...