If the flashing fails immediately, you may have the wrong version of the firmware for your specific hardware revision. What error message are you seeing in the SPD tool? Which Windows version are you using?
You might wonder why the keyword specifically mentions . SPD stands for Spreadtrum , a Chinese chipset manufacturer (now known as UNISOC). The Jazz Digit 4G Lite utilizes a Spreadtrum CPU (typically the SC7731E or a similar variant). jazz digit 4g lite flash file spd