Had to do this
My laptop was stolen and several months later it was actually returned, but the thing had been bricked by the thieves witht the supervisor password nonsense. I also had the 3 year warranty and gold support or whatever from lenovo and they refused to fix it even though I'm the registered owner. Pretty frustrating. They explained that if the motherboard hardware failed they would replace it.
What I did was find the TPM chip on the motherboard, solder a few wires to it, hook up the serial connection and reset it. not an easy task and not for the faint of heart, but i figured it was bricked anyway so I took the risk.
not the easiest solder connection on that board and it was on the bottom of the unit, it was challenging but in the end i got it fixed.