Camera does not work after replacment

My cameras do not work after replacing both of the rear camera in my LG G6. I get a camera fail error and my default flashlight does not work as well. The only way for me to get it somewhat working is to hold the camera and button and pick selfie camera. I get the flash light working if I manually turn the flash on. Does this only give me access to the wide angle camera. I have tried a hard reset, safe mode, updated firmware. Only way to get the camera going 100% is to install the old camera modules. Am I missing a step? Faulty camera modules?