There is no single universal code that works for every SPD device. Instead, several distinct methods exist, ranging from built-in engineering menus to powerful PC software.
Many SPD-based phones allow access to hidden repair menus via dialer codes. These codes vary by manufacturer and specific chipset. *#*#83781#*#* – Common for SPD/UNISOC engineering mode. spd android imei repair code
Before attempting repairs, you must verify the current status. SPD devices use a specific diagnostic port that must be enabled. There is no single universal code that works