2200 Machine Type And Serial Number Are Invalid Lenovo

Solved Replaced Lenovo motherboard-BIOS invalid serial number. The double-beep and warning about invalid machine type and serial number. Lenovo is telling me I. Machine Type Invalid and Serial Number are invalid: thinkpad. This is what I'm shown for about 3 sec before normal boot starts. It's one big annoyance on my. Machine Type and Serial Number are invalid. States its invalid. 2200: Machine Type Invalid. Type and Serial Number are Invalid. Lenovo is committed to.

• Download ThinkPad Hardware Maintenance Diskette (HMD). I have 1.83 attached here. You can certainly find other versions on the Internet somewhere. • DO NOT use windows 10!! I've only tried windows 10 & 7, both 64 bit. Windows 7 worked with all my flash drives.