I tried updating the firmware to the latest and greatest through the app. I powered up the remote, then the p4. I looked at the battery and the the middle 2 lights were on. (others off). I cannot power the battery down or reset. I held button in for more than 30 sec. I put it back in the quad and got critical battery error. It has been 3-4 days and the 2 green lights are on. I tried plugging into power but 2 green lights stay on. Tried putting into the quad to see if I can power off..nothing. Anyone else had issue with battery error? Anything else I can try? Thanks in advance for any help.