Use A Golden Key U1 Tool To Flash-Write Key Id Information; Remove The Upper Case (With Keyboard) - Lenovo Yoga 9i Hardware Maintenance Manual

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 FRUs (CRUs) have been removed.
"Remove the lower case" on page 29
"Remove the antenna module" on page 32
Step 1. Disconnect the battery pack, I/O board cable and the EDP cables from the system board. Then,
remove four screws.
Figure 20. Disconnect cables and remove four screws
Screw specifications
M2.5 x L4.5
Step 2. Rotate the upper case to an angle larger than 270° degrees. Then, remove the upper case (with
keyboard).
for detailed instructions on how to create
Number of screws
4
.
Chapter 4 Removing a FRU or CRU
41