Use tweezers to carefully grasp and unhook all 7 flex cable connectors.

With the same tweezers, pry off the cable clasp that connects the motherboard to the sub PCBA.

Once the motherboard is disconnected from all components, use the tweezers or your fingers to remove it from the phone assembly.

Use the Anti-Static Wrist Strap to eliminate the possibility of introducing a static force that may damage the motherboard components.