As the new Security Updates have been pushed since the .9 version, most of the cam models have been experiencing failed updates.
Note I say Failed Updates rather than Bad Firmware. The update process is failing, not the new Firmware versions. I have successfully updated all 16 of my V3 cams to every Beta Firmware and Production Firmware version releases since installing them oh so many moons ago. I have yet to experience a failed update or the need to flash a cam to recover it, on any model I own.
But, I do it one single cam at a time and I am running my IoT on a rock solid, 100% connectivity uptime, 4 node Mesh.
I have also gone thru the process of taking a recently updated V3 cam and flashing it back to each of the last multiple update versions and then flashing it back forward. The Flash Process also works and none failed. The Firmware is solid even though there may be some feature and functionality bugs that need fixed. But, they still boot and run.
The problem, IMO, is in the file transfer and install loosing integrity. The cam is getting incomplete package delivery and install. The cam can’t help but puke when the Smart bits in the logic are missing.