Unofficial (Simplified) Libreboot Documentation
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      • ThinkPad X60 Tablet recovery
      • ThinkPad X60/X60T/T60 internal flashing
    • Changing the MAC address
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ThinkPad X220/X220T

X220/X220 Tablet is essentially the same as the X230, but cannot be flashed internally; you must use an external flasher.

Otherwise, look at X230 disassembly. Note that the X220 has a single 8MB flash, instead of 8MB and 4MB.