Use A Golden Key U1 Tool To Flash-Write Key Id Information; Remove The Upper Case - Lenovo IdeaPad 1 Series Hardware Maintenance Manual

Figure 33. Remove the system board
Screw specifications
M2 x L4
M2.5 x L4.5
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

Make sure the following FRUs (CRUs) have been removed.
"Remove the lower case" on page 28
Step 1. Disconnect the battery pack cable. Then, remove six screws.
Number of screws
1
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