ThinkPad T420 Coreboot Upgrade for Ivy Bridge CPU (Stock BIOS Fix!)

Brought my ThinkPad T420 back to life with Coreboot 🔧🔥 This time it wasn’t just for speed — I flashed Coreboot so I could run a newer Ivy Bridge CPU that wouldn’t work with the stock BIOS. Now it boots clean and handles the upgrade like a champ. Big shoutout to John Ling for the super helpful guide that made this possible 🙌 Check it out if you want to try it yourself: https://www.johnling.me/blog/Coreboot... I show the boot process, talk through the upgrade, and share how it all turned out — let me know if you’ve done similar mods! #ThinkPad #Coreboot #T420 #IvyBridge #Tech