Lenovo SYSTEM BOARDS
5B21D53657
is compatible in the following Models:
Lenovo ThinkPad X Series laptops
ThinkPad X1 Extreme 4th Gen (20Y5,20Y6) Laptop - 20Y5CT01WW
ThinkPad X1 Extreme 4th Gen (20Y5,20Y6) Laptop - 20Y5CTO1WW
ThinkPad X1 Extreme 4th Gen (20Y5,20Y6) Laptop - 20Y5S00X00
ThinkPad X1 Extreme 4th Gen (20Y5,20Y6) Laptop - 20Y6S0DP00