Use A Golden Key U1 Tool To Flash-Write Key Id Information; Remove The Upper Case (With Keyboard) - Lenovo 81WE00DDCC Hardware Maintenance Manual

Screw specifications
M2 x 2.5
M2 x 3.5
Step 3. Remove the system board.
Figure 34. Remove the system board
Go to
https://support.lenovo.com/partslookup
replacement part:
System board

Use a Golden Key U1 tool to flash-write key id information

After replacing the system board and re-assembling the computer, use a pre-made Golden Key U1 tool to
start the computer and flash-write the serial number (SN), machine type (MT), product name (PN), and UUID
to the new system board.
The Golden Key U1 tool is prepared by running the U1 Update software on a FAT32-formatted USB thumb
drive. Go to
http://support.lenovo.com/us/en/solutions/HT506954
and use a Goldern Key U1 tool.

Remove the upper case (with keyboard)

Make sure the following FRU ( or CRU) has been removed.
"Remove the lower case" on page 28
Number of screws
3
2
to look up the Lenovo part numbers of the following
for detailed instructions on how to create
.
Chapter 4 Removing a FRU or CRU
47