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Enter Diag Mode Spd -

(e.g., on an LCD display)

This works for SPD industrial monitors and commercial displays.

Note the corresponding number (e.g., COM5 ). You will need to select this exact port inside your diagnostic repair software to run further procedures.

Write or restore corrupted IMEI data to fix "No Service" issues. Technical Prerequisites

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If the device is powered on and has USB Debugging enabled, you can sometimes force the switch via terminal: adb shell su setprop sys.usb.config diag,adb Use code with caution. Copied to clipboard

If your phone is stuck in a loop showing "Enter Diag Mode" on the screen: Force a restart using the power button.

Diagnostic (DIAG) Mode opens a dedicated communication interface between your mobile device and a computer. This interface allows service software to read and write low-level hardware data, repair corrupted IMEI addresses, calibrate radio frequency (RF) bands, and execute advanced service configurations. What is SPD Diag Mode?

Connect the powered-off phone without holding any buttons. The software will send a custom payload to trigger the diag switch automatically. Method 3: ADB Command String (Rooted Devices) enter diag mode spd

Entering Diag Mode is the "golden key" for servicing Spreadtrum devices. Whether you use the hardware button method or the Engineer Mode dialer code, always ensure your are correctly installed to see the COM port in your Device Manager.

Connect your device to your workstation and open a command prompt inside your ADB directory. Verify connection stability and gain root permissions: adb devices adb shell su Use code with caution. Execute the system property override command: setprop sys.usb.config diag,adb Use code with caution.

After the repairs are done, exiting Diag Mode is usually as simple as a long press on the power button to force a reboot or sending an "MTP" command via ADB to switch the device back to its standard file-transfer state.

: You must install the official Spreadtrum/UNISOC Drivers ( SciU2S or sprd_usb_driver ). This ensures your computer correctly assigns a virtual COM port when the hardware switches modes. Write or restore corrupted IMEI data to fix

Before attempting any of the methods below, ensure you have the following:

For devices like or similar surge protectors with monitoring.

Before attempting any diagnostic procedures, prepare your workspace environment with these essential downloads and configuration settings:

There are multiple ways to force an SPD-powered phone into Diagnostic Mode. Choose the method that best aligns with your current technical state and equipment. Method 1: Using Hardware Service Dongles (NCK Pro / CM2) repair corrupted IMEI addresses

When a device is in Diag Mode SPD, it enables the testing and calibration of different hardware components, such as:

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