Android headunit front camera - Android Q&A, Help & Troubleshooting

Hi, new here
I don't know if anybody can help with my issue but here goes
I have an A-sure android headunit I am currently running a reverse camera but I want to run a front camera that works with reverse camera for parking. The headunit comes with pre installed "f cam" app when I tap the app I can switch between rear cam (shows reverse cam image) when I switch to front cam I get a yellow ? I have a camera running through AV in but that doesn't switch when reverse is engaged.
Does anybody have an android headunit running a front camera, which pins are for front camera?
Sorry but I can't workout how to add a photo of the back of my headunit?

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