You may plug the rear camera into the interior port and plug the interior camera into the rear port to confirm which part is defective since they can exchange to work.I'm glad it's fixed with the Reset. I tried Reset twice (once via the buttons and once in the Viofo app) on my A139 3-Ch and it did not fix the issue with the Interior Cam input not responding. In addition, when I try to assign the interior cam as the priority cam to show in the app, it says 'interior cam not available'. I had a cable plugged into the interior cam input at the time. I am curious what the issue is, such as was it something physical or electronics? I will be sending it in soon to have it examined. I hope they will let me know what the actual issue was.
I plugged the Rear cam and the Interior cam into the Interior input. Does not work.You may plug the rear camera into the interior port and plug the interior camera into the rear port to confirm which part is defective since they can exchange to work.
In this case, you can contact our customer service to claim a warranty: https://support.viofo.com/support/tickets/new?I plugged the Rear cam and the Interior cam into the Interior input. Does not work.
I plugged the Rear cam and the Interior cam into the Rear input. Both cams work.
So, the problem is the Interior cam input.
The button is a hardware reset, in the app you just reset camera settings to default.once via the buttons and once in the Viofo app