Users are sometimes going into fastboot mode, resulting in unclear Lost Connection errors.

[nelsonjchen]

They may be watching an old tutorial video on getting their devices to flash. They may be searching Discord and coming across old information.

In fact, to the best of my knowledge, there are no updated videos available at the moment. And there's a lot of information on Discord and other older text resources pointing to fastboot mode methods.

Unfortunately, their devices are in fastboot mode and they get an unclear "Lost Connection" message:

https://discord.com/channels/469524606043160576/524592892627517450/1289393573568974962

Some proposed solutions

Simple

Just add some more string to the Lost Connection at https://github.com/commaai/flash/blob/master/src/app/Flash.jsx#L84

Maybe something like. Another possible cause is your device is incorrectly in Fastboot mode and if so, please follow the instructions on this tool to get it into the correct QDL mode.

More Complex

Detect fastboot mode with some lightweight "ping"-ish command and error out with a variant of the message in Simple

Most complex

Detect fastboot and do a fastboot flash. Of course, I don't think this should be done for but just putting it here.

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I would prefer that Simple be the approach here but I want to have some comments.