After following the steps of setting up the blueboat, I’ve reached a problem with the autopilot firmware, saying that there is “no data available.” What are the possible reasons for this? Thank you.
Hi @EC6464, welcome to the forum 
Either your BlueOS computer (the Raspberry Pi inside the vehicle) is not connected to the internet, or there is some issue with the connection to the firmware server (e.g. due to a network configuration / firewall, or the server being down).
Have you connected your vehicle to wifi? Your photo is clipping off the part of the header bar which has the internet (globe) and wifi (signal cone) indicators.
I’ve just tried loading that page and the Rover firmware list loaded fine, so it may be worth trying again, in case there was some issue with the server when you tried originally? If that doesn’t work then you may need to try a different network configuration or connection (maybe try a cellular network?).
If that doesn’t help, you can try downloading the firmware you want directly, then installing it via the “upload firmware file” option.