Use A Golden Key U1 Tool To Flash-Write Key Id Information - Lenovo IdeaPad Slim 5i Hardware Maintenance Manual

Figure 29. Remove the system board with I/O board cable
Screw specifications
M2 × L3.5
Step 4. Disconnect the I/O board cable from the system board.
Figure 30. Disconnect the I/O board cable from the system board
Go to https://support.lenovo.com/partslookup
replacement parts:
System board
I/O board cable

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.
Number of screws
6
to look up the Lenovo part numbers of the following
Torque force (kgf.cm)
1.85 ± 0.15
.
Chapter 4 Removing an FRU or CRU
45