Hello.
I'm having some problems updating the ThinkPad t420. By default I have i5-2520m. After changing to i5-3210m, the notebook does not turn on.
After that, I install my old i5-2520m, but it also does not turn on!
Later I learned that before the upgrade you need some manipulations in the BIOS, but it was already late ...
Thank you in advance
Best regard, Boris