I had this same problem two weeks ago !
After a year out from racing, I downloaded the latest software from Speed Passion V24 onto my laptop.
Disconnected the fan and no batteries connected, plugged the LCD program card into the esc, then plugged the card into the laptop.
The laptop connected to the esc on the software, I tapped the Update Firmware, selected Mod2-V21 software, the progress bar got to approx 10% then the screen flashed up Update Failed.
So tried to reconnect and the laptop just keeps asking to connect to the esc.
Solid Amber light on esc, will not accept any input from the receiver either, just this solid amber light.
Basically flocked.
My esc is currently with Schumacher and I await to see if it can be repaired.
Fingers Crossed.
But would still like to know why ?
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