I would switch that breaker, it might be faulty if you hear it arcing inside. The jaguar could also be shorted internally, which is causing the breaker to over current, and thus trip. You might want to open the jaguar and check for metal shavings.
Here is what I would do if I were you. First isolate it so it is the only thing on the CAN bus. Do not forget your terminator. Now upload the firmware to any number, and hope it accepts it. If you are using the 2CAN and you get a timeout response,then it is truely bricked. If it is stuck in bootloader it would accept the upload. Power cycle to bring it back after.
If you use the black jaguar as your bridge, then I direct you
here.
Don't worry, we are 5/5 (bricked/recovered) now after updating to 89.