This is almost always a driver issue. Reinstall the MTK USB drivers, try a different USB port (preferably a USB 2.0 port on the back of the PC), or change your USB cable.
has at least to prevent the phone from powering off mid-process. symphony i95 4g b1 b3 b8 flash file
The keyword in your search is "4g b1 b3 b8," which refers to the phone's 4G LTE frequency bands. Bands B1 (2100 MHz), B3 (1800 MHz), and B8 (900 MHz) are fundamental LTE bands used globally, and their presence in the i95 ensures broad compatibility with many 4G networks. This is almost always a driver issue