A test point is a physical location on a device's motherboard. By shorting these two specific metallic pads (the "JMMAL10" points) using a pair of tweezers while connecting the phone to a PC, you bypass the standard boot process. The "upd" suffix generally indicates a firmware or a specific USB Programming Device interaction intended to revive the phone. Why Use the Test Point? This method is the "last resort" for several scenarios:
Performing a test point short and carries a risk of permanent hardware damage if the wrong points are shorted or if static electricity discharges into the board. Ensure you are grounded and using the exact map for the JMMAL10 board variant. jmmal10 test point upd