I successfully upgraded drone, batteries, and RC to FW v1.3.20 as part of the process to get to v1.4. When I insert sd card into drone with new v1.4 FW and turn drone on, nothing happens. Camera light stays solid green. I reformatted sd, redownloaded FW, turned off/on several times. Any idea? Using DJI go app but haven't moved on to RC.