Lenovo SYSTEM BOARDS
5B21C21558
is compatible in the following Models:
Lenovo ThinkPad X Series laptops
X1 Carbon 7th Gen - (Type 20R1, 20R2) Laptop (ThinkPad) - 20R10022AU
X1 Carbon 7th Gen - (Type 20R1, 20R2) Laptop (ThinkPad) - 20R10023AU
X1 Carbon 7th Gen - (Type 20R1, 20R2) Laptop (ThinkPad) - 20R1CTO1WW
X1 Yoga 4th Gen (Type 20SA, 20SB) Laptop (ThinkPad) - 20SA000YAU
X1 Yoga 4th Gen (Type 20SA, 20SB) Laptop (ThinkPad) - 20SACTO1WW