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Enter Diag | Mode Spd !!link!!

: Open your preferred service tool (such as NCK Box, CM2, or a dedicated SPD Diag tool) on your PC.

: If Method A fails, hold the Volume Down or Volume Up button (the "Boot Key") while plugging in the cable.

Before diving into the methods, it is helpful to understand what these terms mean.

: Download and install the latest Spreadtrum/Unisoc USB Drivers on your computer. Without these, your PC will show an "Unknown Device" or "SCI USB Serial" error with a yellow triangle in Device Manager. Method 1: Using Hardware Key Combinations (Boot Key Method) enter diag mode spd

The software automatically detects the device handshake and switches its internal state, prompting a "Done" confirmation message alongside the newly mapped virtual COM port. Using CM2SP2 / Infinity Box (Diag Helper Tool) Open the CM2SP2 Diag Helper Tool on your computer. Click . Connect the phone in its powered-off state or flash mode.

If you have ADB enabled and the device is rooted, you can force the port open via terminal commands. Connect the phone to the PC with enabled.

If you have tried every combination and still cannot , consider these obstacles: : Open your preferred service tool (such as

Standard USB debugging drivers will not correctly parse a Diagnostic port.

Working with diag mode is powerful but carries risks. Treat these warnings with the utmost seriousness.

If the device boots into Android and is rooted, you can issue terminal instructions through the Android Debug Bridge (ADB) to permanently shift the system configuration. Enable via Settings > Developer Options. : Download and install the latest Spreadtrum/Unisoc USB

For those with access to a repair dongle like the NCK Pro Box, this is by far the most straightforward method. It automates much of the process.

The most common use case is . If a device has lost its IMEI numbers (often due to a firmware corruption or a failed flash), they cannot be written back through normal means. A diag port connection is typically required to re-write these numbers.