Time to clean up and remove the last few pieces of the Alpha puzzle.

This daughterboard, located at the bottom of the device, is home to several components:

Micro USB 2.0 port

Capacitative touch soft buttons

Microphone

Antenna spring contacts

0055 1407 7899 (we suspect this is another Cypress CapSense capacitive touch-sensing controller, like in the Galaxy S5)

Home button switch (on the back)