My PiCar-V won't connect to the internet

I have looked for the host name and I can’t find it. I have also tried to connect it to the PuTTY and it keeps telling me the session timed out.

Please check if the network of your picar-V is stable.
Restart your Raspberry Pi system and go to connect again, or you can connect an external display to try.
If it still doesn’t work, we suggest you reinstall your Raspberry Pi system and go to connect again.
If there is any problem, please provide a video of the problem to us, so that we can analyze and solve the problem.