While less common for SPD than for other chipsets, some specific manufacturers use dialer codes to trigger internal menus:
While holding the button, connect the device to a PC via a USB cable. enter diag mode spd
Entering Diagnostic (Diag) mode on devices is typically done to perform service tasks like IMEI repair, unlocking, or firmware fixes. Unlike Qualcomm devices that often use dialer codes, SPD devices usually require a specific sequence involving a PC and a USB cable. How to Enter Diag Mode on SPD Devices While less common for SPD than for other