Press and hold the and Volume Up buttons simultaneously (some models only require Volume Down). Connect the phone to the PC while holding the buttons.
Press and hold the button (on some models, it’s Volume Up, or both).
Look for a device label containing string variants like , Spreadtrum COM , or SCI USB2Serial . enter diag mode spd
: Open your preferred service tool (such as NCK Box, CM2, or a dedicated SPD Diag tool) on your PC.
Getting your device into this mode requires the correct environment and specific software tools. This article breaks down everything you need to successfully execute the process. Prerequisites Before Forcing Diag Mode Press and hold the and Volume Up buttons
Some SPD-based feature phones or specific smartphone brands (like ITEL, Tecno, or Micromax) use hidden menus: Try dialing: *#*#83781#*#* *#*#9646633#*#* "Debug Log" and toggle the mode to Prerequisites for Success : You must have the Unisoc/SPD USB Drivers
If your device boots successfully into the Android system and allows USB Debugging, you can utilize the Android Debug Bridge (ADB) framework. Look for a device label containing string variants
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: Required for legacy hardware emulation on 64-bit operating systems. 2. Disabling Windows Driver Signature Enforcement
The tool will send a "handshake" signal to the phone to keep it locked in Diag Mode. Troubleshooting Common Issues 1. Port Appears then Disappears
Press or F7 to select Disable driver signature enforcement . Methods to Enter Diag Mode on SPD Devices