The terminal screen refreshed. The standard boot logo vanished, replaced by a raw, scrolling feed of hexadecimal code. It was the SPD—Signal Processing Daemon. This wasn't the user-friendly operating system; this was the digital subconscious of the device, the low-level brain that usually operated silently in the background.
Entering Diag Mode is the "golden key" for servicing Spreadtrum devices. Whether you use the hardware button method or the Engineer Mode dialer code, always ensure your are correctly installed to see the COM port in your Device Manager. enter diag mode spd