Most recent firmware update appears to have borked my mavic - seems to think no battery attached (cannot take off ). Anyone any ideas? Trying to roll back firmware via dji assistant but it continually thinks there's less than 50% power so it just refuses to install once its downloaded...d'oh. Could lichi get around this? Its doing my head in as I'm down in the wild west of ireland and the scenery is amazing. Have two batteries, neither work...its not the -2 led- issue and it's not the "battery authentication error" I've seen someone else have recently...its "battery signal error"