Try switching the tool configuration from "Normal Mode" to "Calibration Mode" or vice versa. Ensure you are using the correct boot key combination for your specific handset model.
IMEI numbers are stored in a dedicated, protected network configuration partition of the device's NAND or eMMC storage, commonly referred to as the NVRAM (Non-Volatile Random-Access Memory) or NVDATA partition. sc7715 imei tool latest version
Writes identification data directly to the protected NVRAM partition. Try switching the tool configuration from "Normal Mode"
to identify the COM port associated with the "Spreadtrum COM Enumerator." In the tool, select this COM port. : Click on Mode Select Normal Mode , and then click Read Device Info and then click Read Device Info