No one could establish the unit to be FYT based on this post.
without that info recommending a configuration setting which is applicable only to FYT based units is just as useless. I request you stop making assumptions about my posts as you might be lacking prerequisite knowledge.
Knowing what the unit is, is everything. A cursory read thorough MTCD forums show just how misunderstood it is, and without my posts and reporting to moderators the forums quickly fill up with out of topic posts and the real development falling off.
If every new post started with, my unit is "ANDROID SYSTEM INFORMATION + MCU version" then those that actually know could recommend and not enter a tool like guessing game.
Would be great if you begun assisting too, if not, not a problem and if you don't like a post the report button is always available to you.
For a hands-free bluetooth dialing app that works with FYT 7862 head units, I recommend the free "Voice Call Dialer" by ArtostoLab, which is available on the Google Play store. It allows you to say the name of the person in your contacts list that you want to call on your cell phone over the Bluetooth connection, and it confirms the contact's name by displaying it as it counts down from 3 seconds (you can configure this value) before it initiates the Bluetooth phone call.
Previously I used the Google Assistant to make calls, but when I upgraded my old PX5 to the Joying 7862 10.5 inch 1280x720 head unit I found that the only way I could get Google Assistant to make call using my voice was by setting the "Smallest Width" DPI value in the "Developers options" to a value of 596 or less, and using an older dialing app called "GVC Callhandlert 4 Joying" which is described here: Joying forward dial requests from Google Voice
By replacing the old GVC dialing app with the Voice Call Dialer, I am now able to set my screen to full resolution, with the "Smallest Width" DPI value set to 720 DPI. I am not able to make a voice call _directly_ from Google Assistant, but I can tell Google Assistant "Voice Dialing", and then I can just say the name of the person I want it to call.
Edit: I had a typo in the open command, and the word "open" is optional.