My Elitebook with Windows 8.1 worked fine, the only thorn in the side being that the BIOS was password protected. Then this happened: I bought BIOS chips on eBay and had them installed. First the computer showed no life at all, and then, after improving a soldering, the CAPS Lock led blinked once, repeatedly, meaning CPU failure. I then remounted the original BIOS chips, and the computer became (almost) normal again. On every start up this message is shown, while a counter is counting down: “The embedded controller MUD data is not valid while MPM is locked. Please unlock MPM, and lock again to capture valid MUD data.” When the counter reaches 0, Windows starts normally. My questions are: Q1: What does this message mean? How do I get rid of it? Q2: I have found another chip vendor – should I give it a try, or are all BIOS chip vendors doomed to fail for this model?