If the USB Burning Tool fails at 2% or 7%:
Unlocking this device is a technical process that involves "tricking" the hardware into accepting a new operating system. Here is the standard procedure followed by the community:
For some devices, an unlock code is required. This might involve contacting the manufacturer or using a third-party service. Be cautious with third-party services, as they may charge fees or pose risks to your device.
Different firmware files are required for vs. V8 bootloaders. PC Connection