If the phone just starts charging when plugged in, you haven't hit the boot key. Common RDA boot keys are the 'Center/OK' button, 'Dial' button, or '*' and '#' together.
Choose your specific CPU type from the dropdown menu (e.g., Coolsand 809C or RDA8851 ). Check the box labeled or Repair NV . 3. Establish a Boot Connection coolsand rda imei repair code best
Ensure your computer's Device Manager detects the phone as a COM port when plugged in. 2. Configure the Service Tool If the phone just starts charging when plugged
: Choose the appropriate Coolsand or RDA CPU model in the software interface. coolsand rda imei repair code best
– The traditional Mediatek and basic feature-phone cross-compatible engineering shortcut.