If you are not comfortable with the technical risks, some ISPs will switch the B866v2 to bridge mode for you over the phone. Call them and say: "I need a public IP address on my own router. Please switch my ZTE ZXV10 B866v2 to bridge mode and disable the internal routing."
or "shorting pins" on the motherboard to force the device into Fastboot mode Methods for B866V2 Liberation
Leo knew the ZTE B866V2-H was a powerhouse, capable of 4K streaming and high-performance output, yet he felt like he was driving a supercar in a school zone. He began his journey by scouring the digital underground of forums like Reddit , looking for the elusive stock firmware that would set the hardware free.