Turn off your phone completely. Hold the Volume Down or Volume Up button (depending on the model) and connect it to the PC via USB.
The MT6755 (Helio P10) remains a popular chipset for legacy support and custom ROM development. However, the integrity of your is the difference between a working phone and a paperweight. Always ensure you are sourcing your files from reputable firmware repositories or extracting them directly from a working device using an MTK Droid Tool or Miracle Box.
Use this for small fixes or flashing a custom recovery. Firmware Upgrade: Use this if the device is boot-looping.
If the scatter file isn't 100% verified for your specific sub-version of the MT6755, the Boot ROM (BROM) will reject the connection. Conclusion