Read this entire post for v3 Pro. And make sure you use an Empty 32GB or smaller SD card. in FAT32
Firmware may be found here. I used .4679 yesterday. I did not do the step of a factory reset either. I just put i the card with the firmware on it, held down setup button, plugged in and was done is a few minutes. Removed the SD card after the cam cam back online.
**NOTE: ** For the V3 cameras you have to rename the file as per directions for the V3 Here.