Thank you! This helped me too although I have the ThinkPad L480 [B]Type 20LS [/B]not 20LT. I had the same errow showing "[B](A7) Me Downgrade - Request MeSpiLock Failed[/B]"​ and always shutting down after ~40 seconds or less indepentendly if I was in BIOS or OS. The BIOS-Chip is a MX25L12873F.. near the Intel WiFi-Module and above the second RAM-Slot.
Now it runs fine without any error message. The only question I have here is if it is expected to run fine like in the sense if the BIOS is somehow less important atleast if it is in the same category as in product line, model...

Hello,
I'm new to this forum i found about in the search fixing the faulty bios of my fathers laptop. I'm not really an expert insofar that i'm not familiar with technical details en detail etc., but it is enough, to try to solve some problems by myself relying on information already in forums and so on. I could send the laptop to a mech but rather I will try it myself to save some bucks and learn something new and how to do it (also the laptop was very cheap, it could be cheaper to buy a new one instead to bring it to a mech). I was sat in front of a computer relatively early comprehend...