When doing the firmware upgrade for my slave rremote, I bricked my battery. I had no lights, and got no lights when connecting to the charger. In chat with tech support they told me to put the battery in the aircraft with the bin file in the flash drive. I thought it was a waste of time because the battery wouldn't power up. But as soon as I slipped the battery into place (and without pushing the "power button") the aircraft began beeping and the lights began flashing as they do in a normal firmware flash. After 12 minutes it is still flashing, but I am pretty sure this is going to work, so I thought I'd pass the word on right a way, will follow up post as soon as the update is complete. Should only be a few more minutes. OK, it's fixed. It kept flashing yellow, and beeping, (for over an hour) so I turned on the transmitter, and it linked to the AC, so I shut off the battery, and then it turned on fine. Still hasn't updated the battery firmware according to the app. But it all works fine now.