Input the original 15-digit IMEI numbers found on your device's box or under the battery.
The device's bootloader or secure boot partition may block unauthorized NVRAM modifications. You must use a device-specific DA (Download Agent) file or unlock the bootloader to clear this hardware block.
Open the on your Windows PC. Turn off the target phone completely. Hold down the device's boot keys (typically Volume Up + Volume Down or just Volume Down ) and connect it to the PC via USB. Look closely at the Device Manager for a port named SPRD U2S Diag or Spreadtrum COM Port . Note down the assigned COM Port Number (e.g., COM4, COM12). Step 3: Align the Software Mode
The V4.1 iteration introduces several stability improvements and broader chipset support compared to its predecessors.
Remove the battery (if possible), re-insert it, and turn the phone on. Dial *#06# on your phone to verify the new IMEI numbers. Important Considerations and Risks
Select your preferred mode. is generally recommended for unresponsive or freshly flashed devices. Step 3: Connect the Device
: The tool operates in multiple connection environments, including Normal Mode (via Diag port) and Calibration Mode for deep system writes.
However, for legitimate technical purposes like phone repair, manufacturers and engineers have developed official tools to read and write identifiers. The (often referred to generally as the "Spreadtrum IMEI Tool") is one such official utility. Specifically designed for devices powered by Spreadtrum (now part of Unisoc) processors, this tool, often referred to by users as Spreadtrum IMEI Tool V4.1 , is used to write or restore a phone's IMEI number, serial number (SN), Bluetooth address (BD_ADDR), and Wi-Fi MAC address to factory specifications. This process is crucial for repairs after a baseband or NVRAM corruption that causes the device to show an "Invalid IMEI" or "Null IMEI" error, which prevents network connectivity.
Using the Spreadtrum IMEI Tool V4.1 is relatively straightforward. Here are the steps:
