I added H3-2D gimbal to my P2, then tried to upgrade RC firmware to V188.8.131.52 with RC Assistant Software. I got a message that the upgrade failed. The RC red power indicator went out when I got the fail notice and now it seems to have no power. I'm stuck. Is there a reset button on the Remote Control? I also installed new AA Bats, but nothing. Anyone else have this happen? Edit: Other posts seem to imply that "I have Bricked my TX". I am still looking for remedy.