Bricked bafang controller. Easy fix.

[outbrdman]

With the Besst tool and a controller that’s not bricked, load the firmware, and right before it installs it to the controller, disconnect the battery and display harness, and plug in your bricked controller to battery and display harness, and continue the install.

 

[A-DamW]

Interesting, I presume you have successfully done this?

 

[outbrdman]

Interesting, I presume you have successfully done this?

Yes i have, twice.