Bluetooth on the Lenovo Thinkpad X220 with Windows 10 - Andrew Oakley
Removal and installation steps of Bluetooth daughter card - ThinkPad X220 Tablet and X220i Tablet - Lenovo Support CO
Removal and installation steps of DC-in connector, base cover, fan, digitizer pen case, and pen switch assembly - ThinkPad X220 Tablet and X220i Tablet - Lenovo Support IT
Removal and installation steps of backup battery - ThinkPad X220 Tablet and X220i Tablet - Lenovo Support BG