Binning products into segments is different than blowing e-fuses. When I bought a 486SX I got a 486SX. It remained forever what it was when I bought it. In a h

Binning products into segments is different than blowing e-fuses. When I bought a 486SX I got a 486SX. It remained forever what it was when I bought it. In a hypothetical scenario where I somehow "unlocked" the FPU functionality Intel couldn't push out a mandatory firmware upgrade to blow an e-fuse in my chip, fixing the "vulnerability" that allowed me to access the FPU and simultaneously preventing me from ever loading "vulnerable" firmware again (like, say, the Nintendo Switch).