Next thing we need to do is to solder the two layers together. Before soldering, we need to remove heat insulation adhesive on the lower layer. Then apply some Paste Flux to the third space PCB. Get the upper layer in position. Power on the heating platform. With temperature of the platform reaching 155℃, continue heating for 1 minute.

Power off the heating platform. Wait for the motherboard to cool for 5 minutes. Now we can assemble the phone and test. Connect the phone with the computer. Restore the phone via iTunes. The phone can be normally restored. Once completed, the phone turns on normally. We can see SN and IMEI number here.

Since the motherboard is iCloud locked, the activation work can only be finished by its owner.